Troubleshooting

RENR2696-01 99
Troubleshooting Section
Test Step 5. Check the Engine Harness.
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Illustration 24
A. Turn the keyswitch to the OFF position whi le the
engine is OFF.
B. Disconnect ECM connector J1/P1. Verify that all
of the +5 V engine pressure sensors that are
attached to the ECM connectors are disconnected.
•
Engine oil pressure sensor J201/P201
•
Intake manifold pressure sensor J200/P200
C. Measure the resistance from P1-26 +5 V Engine
Pressure Sensor to each of the following terminals:
•
P1:14 Intake manifold Pressure
•
P1:24EngineOilPressure
a. Wiggle the harness during the measurement in
order to reveal any intermittent short condition.
Expected Result:
Each resistance measurement is more than 20 ohms.
Results:
•
OK –The+5Vlineisnotshortedintheengine
harness. Ensure that the engine harness is
connected to the ECM and that all of the sensors
are reconnected. There does not appear to be a
problem at this time. Clear all diagnostic codes.
Continue to troubleshoot until the original condition
is resolved. STOP.
•
Not OK
Repair: Replace the engine harness. Clear all
logged diagnostic codes. Verify that the repair
eliminates the problem.
STOP.
i01798196
Air Inlet Heater C ircuit - Test
System Operation Description:
The air inlet heater is a cold starting aid.
Use this procedure under the following circumstances:
•
Check voltage for the air inlet heater starting aid.