Innova GM 3123 Owner's Manual
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Innova GM 3123 Owner's Manual

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  • Page 2: Table Of Contents

    Table of Contents Paragraph Title Page No. YOU CAN DO IT! ............ii GENERAL INFORMATION YOUR VEHICLE'S COMPUTER SYSTEM ....1-1 ABOUT YOUR CODE READER......... 1-2 TEST CONNECTOR LOCATIONS ......1-2 SAFETY PRECAUTIONS ........... 1-3 VEHICLE SERVICE MANUALS ....... 1-3 PRELIMINARY VEHICLE DIAGNOSIS ....

  • Page 3: You Can Do It

    You Can Do It! Plug It In • Test connector usually found under the left side of the dashboard. • Set Selector switch to ECM A-B position. • Make sure ignition is off. Plug Code Reader into test connector. Read Fault Codes •...

  • Page 4: Your Vehicle's Computer System

    1.1 YOUR VEHICLE'S COMPUTER SYSTEM Today's vehicles are equipped with computer self-testing abilities that can locate problems in your vehicle and store them as service codes in the vehicle's onboard computer. The Code Reader allows you access to the computer's memory and recalls the service codes.

  • Page 5: About Your Code Reader

    General Information NOTE : For Saturn vehicles, either the "Shift to D2" light or the "Temperature" indicator light is used to transmit Saturn Electronic Transmission codes. 1.2 ABOUT YOUR CODE READER The Code Reader is a device which connects to your vehicle's computer self-test connector.

  • Page 6: Safety Precautions

    1.4 SAFETY PRECAUTIONS • Always observe safety precautions whenever working on a vehicle. Always wear safety eye protection. Only work on your vehicle in a well-ventilated area. Put transmission in “park” (for automatic) or “neutral” (for manual). Set parking brake. Put blocks on drive wheels.

  • Page 7: Preliminary Vehicle Diagnosis

    General Information 1.6 PRELIMINARY VEHICLE DIAGNOSIS WORKSHEET The purpose of this form is to help you gather preliminary information on your vehicle before you retrieve codes. By having a complete account of your vehicle's current problem(s), you will be able to systematically pinpoint the problem(s) by comparing your answers to the fault codes you retrieve.
  • Page 8 WHEN DID YOU FIRST NOTICE THE PROBLEM: Just Started Started Last Week Started Last Month Other: LIST ANY REPAIRS DONE IN THE PAST SIX MONTHS: PROBLEMS STARTING No symptoms Cranks, but will not start Will not crank Starts, but takes a long time ENGINE QUITS OR STALLS No symptoms Right after vehicle comes to a stop...
  • Page 9 General Information AUTOMATIC TRANSMISSION PROBLEMS (if applicable) No symptoms Vehicle does not move when in Shifts too early or too late gear Changes gear incorrectly Jerks or bucks PROBLEM OCCURS Morning Afternoon Anytime ENGINE TEMPERATURE WHEN PROBLEM OCCURS Cold Warm DRIVING CONDITIONS WHEN PROBLEM OCCURS Short - less than 2 miles With headlights on...

  • Page 10: Vehicles Covered

    2.1 VEHICLES COVERED This Code Reader may be used to retrieve engine service codes from most General Motors (GM) and Saturn domestic cars and trucks (EXCEPT Geo, Nova, and Sprint). Includes all models EXCEPT Cadillacs and diesel vehicles. Specific makes and models are listed below.

  • Page 11: Before You Begin

    Retrieving ECM Codes Model Year Make Model 1995 Chevrolet Caprice 4.3 liter Saturn All models Trucks All one ton capacity or less with gas and Vans engines (EXCEPT S/T Series vehicles) * Not applicable to models equipped with climate control computers NOTE: For 1994 and 1995 vehicles, only the models listed...

  • Page 12: Retrieving Service Codes

    Please read your vehicle’s service manual for proper connection of vacuum hoses, electrical wiring, and wiring harness connectors. Check the following areas: All fluid levels Air cleaner and ducts Belts Mechanical linkage associated with sensor Vacuum hoses Spark plugs and wires Electrical wiring Electrical connectors Proper battery voltage...
  • Page 13 Retrieving ECM Codes • Each code is transmitted three times before the next code is sent. • Code sets will begin with Code 12 ("System Pass") even if fault codes are present. • The codes will continue to be sent as long as the ignition is on and the Code Reader is connected.
  • Page 14 NOTE: It may be necessary to test drive the vehicle to reset "hard" fault codes 13, 15, 24, 44, 45, and 55 after they have been erased. If "Service Engine Soon" light does not turn on, the initial stored fault codes were all "intermittent" fault codes. (Refer to the "Diagnostic Procedures"...

  • Page 15: Erasing Service Codes

    Retrieving ECM Codes will still affect it) before retrieving trouble codes. Refer to your vehicle's service/repair manual for specifications and system testing procedures which apply to your particular vehicle. 2.4 ERASING SERVICE CODES • Always observe safety precautions before and during testing process.
  • Page 16 2.5.1 GM Engine/Electronic Transmission Service Codes; Saturn Engine Service Codes CODE SERVICE CODE DEFINITION (Saturn vehicles ONLY): Indicates transmission service codes will be displayed next on the "Shift to D2" light (1991-92 models) or "Temperature" indicator light (1993 and later models) Diagnostic mode;...
  • Page 17 Retrieving ECM Codes CODE SERVICE CODE DEFINITION Vehicle speed sensor (VSS) - open or short circuit problems or park/neutral switch circuit problem Manifold air temperature (MAT) sensor - signal voltage is low or high Vacuum switching valve circuit open or shorted to ground ATS sensor - signal voltage is high or low Quad-Driver module or Quad-driver No.
  • Page 18 CODE SERVICE CODE DEFINITION Mass air flow (MAF) sensor - signal voltage or frequency is high during engine idle Manifold absolute pressure (MAP) sensor - signal voltage is high during engine idle (Note: Engine misfire or unstable idle may cause this code) Mass air flow (MAF) sensor - signal voltage or frequency is low during engine cruise Manifold absolute pressure (MAP) sensor - signal...
  • Page 19 Retrieving ECM Codes CODE SERVICE CODE DEFINITION Electronic spark timing (EST) circuit - open or shorted Direct ignition system (DIS) fault - bypass circuit open or shorted to ground during engine run Fuel cutoff relay circuit - open or shorted to ground Electronic spark timing (EST) circuit - low voltage detected Electronic spark control (ESC) - circuit problems...
  • Page 20 CODE SERVICE CODE DEFINITION Vacuum sensor circuit fault or quad driver "B" fault (3.8L VIN1) Corrosivity/add coolant Boost control problem (3.8L VIN1) Vehicle Anti-Theft System fault (3.8L) Transmission Temperature Sensor (TTS) - short circuit Transmission fluid temp high Transmission Temp Sensor (TTS) - open Transmission fluid temp low Transmission not in drive Oxygen sensor signal fault or port throttle system fault...
  • Page 21 Retrieving ECM Codes CODE SERVICE CODE DEFINITION On-board cruise control switch circuit problems Servo Position Sensor (SPS) circuit fault or shorted A/C clutch relay circuit (Corvette) or overdrive ratio error Air conditioning head pressure switch circuit fault or air conditioning pressure switch problem Torque converter clutch stuck "on"...
  • Page 22 CODE SERVICE CODE DEFINITION Internal PCM communication fault (Saturn) or QDM Solenoid "A" monitored voltage differs from commanded Ignition system fault - 3X signal problem Torque Converter Clutch (TCC) solenoid - circuit problems Reverse Inhibit - open or short circuit in reverse inhibit solenoid 3-2 Control solenoid - open or short circuit problems Skip shift solenoid - open or short circuit problems...
  • Page 23 Retrieving ECM Codes 2.5.2 Saturn Electronic Transmission Service Codes • Transmission codes will be transmitted (if present) after all engine codes are transmitted and code 11 has been sent. Code 11 indicates that transmission codes are present and will be transmitted on the "Shift to D2" light (1991-92 models) or the "Temperature"...
  • Page 24 CODE SERVICE CODE DEFINITION Hold mode voltage is too low Reference input intermittent Gear selector error signal Powertrain Control Module (PCM) computer circuit problem Hold mode stuck "on" Battery voltage out of range Hold mode stuck "off" ESC (Knock present) Powertrain Control Module (PCM) computer circuit problem 5-volt reference ground...
  • Page 25 Retrieving ECM Codes CODE SERVICE CODE DEFINITION 3rd line circuit - grounded or open Coolant sensor signal unstable Coolant/Transmission temperature sensor ratio error 3rd line circuit - shorted 3rd gear stuck "on" Air temperature sensor signal 4th line circuit - grounded or open Throttle position sensor (TPS) to manifold absolute pressure (MAP) sensor voltage out of range 4th line circuit - shorted...

  • Page 26: Anti-Lock Brake Systems

    3.1 ANTILOCK BRAKE SYSTEMS (ABS) 3.1.1 What is ABS? The ABS system utilizes several mechanical, hydraulic, and electric/electronic components to automatically control hydraulic brake pressure to the rear, or front and rear wheels (depending on the brake system) to prevent wheel lock-up during hard braking.

  • Page 27: Retrieving Service Codes

    Retrieving ABS Codes Year Model ABS Type 1989-93 Astro, "G" Series Van, "R" and "V" Series Kelsey-Hayes Trucks, Safari, Suburban RWAL 1987-94 Blazer, "C" and "K" Series Pickup, Sierra, Kelsey-Hayes "S" and "T" Series Pickup (EXCEPT RWAL 93-94 4.3L M/T) 1989-90 Eldorado, Reatta, Riviera, Seville, Toro- Teves II nado, Delta 88, Bonneville, DeVille,...
  • Page 28 After retrieving ABS fault codes, erase codes using the appropriate procedures for your vehicle and ABS system (paragraph 3.4). Repeat the procedure to retrieve ABS fault codes (step 1, above). NOTE: It may be necessary to perform a thorough test drive to reset some fault codes.
  • Page 29 Retrieving ABS Codes • All codes are two digits. • Count blinks to get the service codes: • First and second digits of code are separated by a 3 second pause. • Second digit of service code is followed by a termination code ("Anti-Lock"...
  • Page 30 • Count blinks to get the service codes. • Codes may be one or two digits. • Codes are displayed as a pattern of one long blink followed by one or more short blinks. Count ALL blinks to get code. •...
  • Page 31 Retrieving ABS Codes • Code 21 looks like: = Code 21 PAUSE BLINK BLINK BLINK NOTE: Service codes will repeat as long as Code Reader is connected. Turn off ignition and remove the Code Reader. 3.3.4 Retrieving Service Codes for Bosch 2S and 2U Systems Turn off ignition.

  • Page 32: Erasing Service Codes

    3.4 ERASING SERVICE CODES • Always observe safety precautions before and during testing process. • Erase codes only when all repairs have been completed. Determine your vehicle's ABS Type (paragraph 3.2) and erase codes using the appropriate procedures: 3.4.1 Teves II 3.4.2 Kelsey-Hayes RWAL 3.4.3...
  • Page 33 Retrieving ABS Codes Connect the Code Reader to the vehicle test connector for one second, remove the Code Reader for one second, reconnect the Code Reader for one second, then remove the Code Reader. Turn off ignition. Reinstall STOP/HAZARD fuse in fuse block. Repeat procedure for retrieving service codes (paragraph 3.3.2) to make sure codes have been erased.

  • Page 34: Abs Service Codes

    The ""Service ABS" light should display code 12 continuously. If any other codes are displayed, repeat steps 1 through 6. Turn off ignition. 3.4.5 Erasing Service Codes for Bosch 2U Systems Turn on ignition and observe "Anti-Lock" light. "Anti- Lock" light should turn off within 3 to 4 seconds. If "Anti- Lock"...
  • Page 35 Retrieving ABS Codes 3.5.1 Teves II System Service Codes Code Service Code Definition Electronic Brake Control Module (EBCM) fault Electronic Brake Control Module (EBCM) fault Main valve fault Left front inlet valve fault Left front outlet valve fault Right front inlet valve Right front outlet valve Rear inlet valve Rear outlet valve...
  • Page 36 Code Service Code Definition Electronic Brake Control Module loop circuit Left front outlet valve Right front outlet valve Rear outlet valve Rear outlet valve Left front Wheel Speed Sensor Right front Wheel Speed Sensor Right rear Wheel Speed Sensor Left rear Wheel Speed Sensor 3.5.2 Kelsey-Hayes RWAL System Service Codes Code Service Code Definition...
  • Page 37 Retrieving ABS Codes 3.5.3 Kelsey-Hayes 4WAL System Service Codes Code Service Code Definition System Normal System Normal (2WD) System Normal (4WD/AWD) System Normal (4WD/AWD) Right front wheel sensor fault Missing right front wheel sensor signal Erratic right front speed sensor Left front speed sensor fault Missing left front speed signal Erratic left front speed sensor...
  • Page 38 Code Service Code Definition 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault 4 Wheel Anti-Lock (4WAL) control unit fault...
  • Page 39 Retrieving ABS Codes Code Service Code Definition Right front solenoid valve fault Left front solenoid valve fault Rear solenoid valve fault Pump motor or motor relay fault Solenoid valve relay fault Electronic Brake Control Module (EBCM) fault Serial data link fault Lateral accelerometer fault;...

  • Page 40: Introduction

    4.1 INTRODUCTION The Society of Automotive Engineers has issued a Standard (SAE J1930) for Electrical/Electronic Systems Diagnostic Terms, Definitions, Abbreviations, and Acronyms. However, at the present time, this Standard is not in wide use by vehicle manufacturers. This Glossary contains definitions for abbreviations and terms you may find in this manual or in your vehicle service manual.
  • Page 41 Glossary BAC – Bypass Air Control valve. BARO – Barometric Pressure. BASE IDLE – Idle rpm determined by throttle switch with idle speed control fully retracted. BCM – Body Computer Module. BOO – Brake On-Off input to the computer. BOOST – Turbo charger boost solenoid or its control circuit. BP –...
  • Page 42 CHECK VALVE – Valve that operates like a one-way gate. CID – Cylinder Identification sensor or its circuit. CKT – Circuit. CL – Closed Loop. CLC – Converter Lock-up Clutch. CO – Carbon Monoxide. COC – Conventional Oxidation Catalyst. COMPUTER TIMING –Total spark advance in degrees before top dead center.
  • Page 43 Glossary DUAL CATALYTIC CONVERTER – Combines 2 converters in one shell. Controls NOx, HC and CO. Also called TWC. DV TW – Delay Valve, 2 Way. DVM (10 MEG) – Digital voltmeter with a minimum of 10 million ohms resistance. Allows measurement in circuit without affecting the circuit operation.
  • Page 44 EMR – Electronic Module Retard, controls spark retard. ENGINE CONTROL MODULE – A microprocessor based device which contains electronic circuitry to control and monitor air/fuel and emission systems, and aid in diagnostics. EPC – Electronic Pressure Control solenoid. EPROM – Erasable Programmable Read Only Memory. ERS –...
  • Page 45 Glossary HPA - High Pressure Accumulator. IAC – Idle Air Control. IAS – Inlet Air Solenoid valve or its circuit. IAT – Intake air temperature sensor, performs same function as MAT sensor. ICM – Integrated Control Module. IDLE TRACKING SWITCH – An input device that sends a signal to the computer to indicate a closed throttle condition.
  • Page 46 MFI – Multi-port Fuel Injection. MIL – Malfunction Indicator Light. Check engine light. MIXTURE CONTROL SOLENOID – Device installed on carburetor, that regulates the air/fuel ratio. MLP – Manual (shift) Lever Position sensor or its circuit. MPFI – Multi-Port Fuel Injection. MULTI-PORT FUEL INJECTION –...
  • Page 47 Glossary QUAD-DRIVER (QDM) – Computer chip, in the PCM, capable of operating four separate outputs. Some have digital and some have pulse width modulated outputs. RAP – Retained Accessory Power. RELAY – Switching device operated by a low current circuit, which controls opening and closing of another higher current circuit.
  • Page 48 TDC – Top Dead Center. THERMACTOR AIR CONTROL VALVE – Combines function of a normally closed air bypass valve and an air diverter valve in one integral valve. THERMACTOR AIR SYSTEM – Efficiency of catalytic converter is dependent upon temperature and chemical makeup of exhaust gases.

  • Page 49: Limited One Year Warranty

    5.1 LIMITED ONE YEAR WARRANTY The Manufacturer warrants to the original purchaser that this unit is free of defects in materials and workmanship under normal use and maintenance for a period of one (1) year from the date of original purchase. If the unit fails within the one (1) year period, it will be repaired or replaced, at the Manufacturer's option, at no charge, when returned prepaid to the Service Center with...

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