Suzuki XL7 2007 Service Manual page 271

Action Taken when the DTC Sets
DTCs P2231 and P2234 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P2231 and P2234 are Type B DTCs.
Diagnostic Aids
• The HO2S voltage should be between 350-550 mV
with the ignition ON. If the voltage is more than the
specified value, there is a condition with the HO2S
circuits. If the voltage does not change after
disconnecting the HO2S, the condition is between the
sensor and the ECM. If the voltage is between 350-
550 mV after disconnecting the sensor, the condition
is with the HO2S.
• Inspect the HO2S harness connector for water
intrusion. Moisture in a connector may cause voltage
to bleed to other circuits within the connector.
Reference Information
Schematic Reference
"Engine Controls Schematics"
Connector End View Reference
• "Engine Control Module Connector End Views"
• "Engine Controls Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
DTC Type Reference
"Powertrain Diagnostic Trouble Code (DTC) Type
Definitions"
Scan Tool Reference
• "Scan Tool Data List - Engine Controls - 3.6L (LY7)"
• "Scan Tool Data Definitions - Engine Controls - 3.6L
(LY7)"
• "Scan Tool Output Controls - Engine Controls - 3.6L
(LY7)"
Engine General Information and Diagnosis:
Circuit/System Verification
1. Ignition ON, observe the appropriate HO2S voltage
parameter. The HO2S voltage parameter should be
less than 1,025 mV.
2. If the vehicle passes the Circuit/System Verification
Test, then operate the vehicle within the conditions
for running the DTC. You may also operate the
vehicle within the conditions that are captured in the
Freeze Frame/Failure Records Data List.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector of
the appropriate HO2S.
2. Ignition ON, verify that the HO2S parameter is
between 350-500 mV.
➢ If greater than the specified value, test the signal
circuit of the HO2S sensor for a short to the heater
circuit. If the circuit/connections test normal,
replace the ECM.
3. If all circuits/connections test normal, replace the
applicable HO2S.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
• "Heated Oxygen Sensor Replacement - Bank 1
Sensor 1: "
• "Heated Oxygen Sensor Replacement - Bank 2
Sensor 1: "
• "Control Module References: " for engine control
module replacement, setup, and programming
DTC P2232 or P2235
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptors
DTC P2232: HO2S Signal Circuit Shorted to Heater
Circuit Bank 1 Sensor 2
DTC P2235: HO2S Signal Circuit Shorted to Heater
Circuit Bank 2 Sensor 2
1A-166