Troubleshooting

(Table 88, contd)
Troubleshooting Test Steps
Values Results
6. Check the Wiring Between the Start Relay and the ECM for
a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the start relay connector. Disconnect the P1 con-
nector from the ECM.
C. Use a multimeter to measure the resistance between the fol-
lowing points:
· P1:53 and all other terminals on the P1 connector
· P1:27 and all other terminals on the P1 connector
Greater than 1 k Ohm Result: Each resistance measurement is greater
than 1 k Ohm.
Contact the Dealer Solution Network (DSN).
Result: At least one of the resistance measure-
ments is less than 1 k Ohm.
There is a short in the wiring between the start re-
lay connector and the P1 connector.
Repair: Check all wiring between the start relay
connector and the P1 connector. Refer to the
Electrical Schematic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
7. Check the Start Signal Wire
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector from the engine ECM.
C. Use a suitable voltmeter to measure between P1:8 and
ground.
D. With the keyswitch held in the START position, note the volt-
age on the voltmeter.
E. Turn the keyswitch to the OFF position.
F. Reconnect the P1 connector to the engine ECM.
10 V to 14 V Result: The measured voltage is less than 10 V.
The fault is in the start signal wiring.
Repair: Check all of the start signal wiring be-
tween the ignition keyswitch and the ECM. Refer
to the Electrical Schematic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
Result: The measured voltage is within the ex-
pected range.
Proceed to Test Step 8.
8. Check the Wiring Between the Batteries and the Starting
Motor
A. Use a voltmeter to check the voltage between the battery+ ter-
minal on the starting motor and a suitable ground on the engine.
The voltmeter must read battery voltage. If the reading is less
than battery voltage, there is a fault in the wiring between the bat-
tery positive terminal and the starting motor.
B. Use a voltmeter to check the voltage between the battery+ ter-
minal and the ground terminal on the starting motor. The volt-
meter must read battery voltage. If the reading is less than battery
voltage, there is a fault in the wiring between the battery negative
terminal and the starting motor.
10 V to 14 V Result: All voltage readings are OK
Repair: Replace the starting motor. Refer to Dis-
assembly and Assembly, “Electric Starting Motor
- Remove and Install”.
Result: At least one of the measured voltages is
not within the expected range.
The fault is in the wiring between the batteries
and the starting motor.
Repair: Check all wiring between the batteries
and the starting motor. Refer to the Electrical
Schematic for the application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged
diagnostic codes and verify that the repair elimi-
nates the fault.
(continued)
184 UENR0612-07
Circuit Tests
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