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6-78 ENGINE GENERAL INFORMATION AND DIAGNOSIS
Step
5
Check Fuel Injectors and Circuit.
1) Using sound scope (1) or such, check oper-
ating sound of each injector (2) when
engine is running. Cycle of operating sound
should vary according to engine speed. See
Fig. 3. If no sound or an unusual sound is
heard, check injector circuit (wire or cou-
pler) or injector.
2) Turn ignition switch OFF and disconnect a
fuel injector connector.
3) Check for proper connection to fuel injector
at each terminal. See Fig. 4.
4) If OK, then check injector resistance.
Injector Resistance : 11.3 – 13.8 ohm at
20°C (68°F)
5) Carry out steps 1) and 3) on each injector.
6) Check each injector for injected fuel volume
(1) referring to Section 6E1. See Fig. 5.
Injected Fuel Volume : 43 – 47 cc/15 sec
1.45/1.51 – 1.58/1.65 US/Imp.oz/15 sec)
7) Check each injector for fuel leakage after
injector closed. Fuel Leakage : Less than 1
drop/min.
Is check result in step 1) and 3) to 7) satisfac-
tory?
6
Check EVAP Canister Purge Valve.
1) Disconnect purge hose from EVAP canister
purge valve.
2) Place finger against the end of EVAP canis-
ter purge valve.
3) Check that vacuum is not felt there when
engine is cool and running at idle. See Fig.
6.
Is vacuum felt?
7
Check Intake manifold absolute pressure sen-
sor for performance (See DTC P0105 (No.11)
Diag. Flow Table).
Is it in good condition?
8
Check Engine Coolant Temp. Sensor for perfor-
mance (See Section 6E1).
Is it in good condition?
9
Check Intake Air Temp. Sensor for perfor-
mance (See Section 6E1).
Is it in good condition?
10
Check Throttle Position Sensor for performance
(See Step 4 of DTC P0121 Diag. Flow Table).
Is it in good condition?
11
Check PCV Valve for valve clogging (See Sec-
tion 6E1).
Is it good condition?
Action
Yes
Go to Step 6.
Check EVAP control sys-
tem (See Section 6E1).
Go to Step 8.
Go to Step 9.
Go to Step 10.
Go to Step 11.
Substitute a known-good
ECM and recheck.
No
Check injector circuit or
replace fuel injector(s).
Go to Step 7.
Repair or replace.
Replace engine coolant
temp. sensor.
Replace intake air temp.
sensor.
Replace throttle position
sensor.
Replace PCV valve.
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