Troubleshooting

(Table 84, contd)
Troubleshooting Test Steps
Values Results
3. Check for Active or Recently Logged Diagnostic
Codes
A. Turn the keyswitch to the ON position. If the engine will
start, run the engine for 15 minutes.
B. Use the electronic service tool to check for active diagnos-
tic codes.
C. Turn the keyswitch to the OFF position.
Diagnostic
codes
Result: One of the following diagnostic codes is active or re-
cently logged:
· 3217-5
· 3217-6
· 3217-13
· 3217-15
· 3222-3
· 3222-4
· 3222-5
Proceed to Test Step 4.
Result: One of the following diagnostic codes is active or re-
cently logged:
· 3217-3
· 3217-4
· 3219-15
· 3219-17
Proceed to Test Step 7.
Result: A 3217-12 diagnostic code is active or recently
logged.
Proceed to Test Step 10.
4. Check the Voltage to the Oxygen Sensor Heater
A. Turn the keyswitch to the OFF position.
B. Disconnect the oxygen sensor.
C. Turn the keyswitch to the ON position.
D. Use a suitable multimeter to measure the voltage between
pin 4 on the harness connector for the oxygen sensor and a
suitable ground.
E. Turn the keyswitch to the OFF position.
10 V to 14 V Result: The measured voltage is not within the expected
range.
The fault is in the 12 V power supply wiring to the oxygen
sensor.
Check all the wiring between the oxygen sensor and the bat-
tery. Refer to the Electrical Schematic for the application.
Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to clear all logged diagnostic co-
des. Run the engine for 15 minutes and use the electronic
service tool to verify that the repair eliminates the fault.
Result: The measured voltage is within the expected range.
Proceed to Test Step 5.
(continued)
172 UENR0612-07
Circuit Tests
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