(Table 187, contd)
Troubleshooting Test Steps
Values Results
3. Measure the Input Voltage to the Lamp at the Lamp
Socket
A. Turn the keyswitch to the ON position.
B. Use the electronic service tool to select the “override” func-
tion in order to switch individual lamps ON and OFF.
Note: The “Override” function is contained in the “Diagnostics”
menu of the electronic service tool.
C. Measure the voltage at the lamp socket.
At least 10 VDC
for a 12 V system.
At least 22 VDC
for a 24 V system.
Result: The voltage is not within the expected range - the
fault is in the battery supply wiring to the lamp.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to verify that the repair elimi-
nates the fault.
Result: The voltage is within the expected range.
Proceed to Test Step 4.
4. Check the Wiring for an Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector.
C. Remove the bulb from the suspect lamp.
D. Use a multimeter to measure the resistance between the
ground connection on the lamp holder and the applicable ter-
minal on the P1 connector.
Less than two
Ohms
Result: The measured resistance is greater than two Ohms
- the fault is in the wiring between the lamp holder and the
ECM.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to verify that the repair elimi-
nates the fault.
Result: The measured resistance is less than two Ohms.
Proceed to Test Step 5.
5. Check the Wiring for a Short Circuit
A. Disconnect the P1 connector.
B. Use a multimeter to check the resistance between the ter-
minal for the suspect lamp and all the other terminals on the
P1 connector.
Greater than 100
Ohms
Result: One or more of the measured resistances is less
than 100 Ohms. There is a short in the wiring between the
lamp holder and the ECM.
Repair: Repair the faulty wiring or replace the faulty wiring.
Use the electronic service tool to verify that the repair elimi-
nates the fault.
Result: All resistance measurements are greater than 100
Ohms.
Contact the Dealer Solutions Network (DSN).
i06165229
Injector Data Incorrect - Test
This procedure covers the following codes:
Table 188
Diagnostic Codes for Injector Data Incorrect
J1939 Code PDL Code Code Description
(code descriptions may vary)
Comments
651-2 1-2 Engine Injector Cylinder #01 : Erratic, Intermittent or
Incorrect
The Electronic Control Module (ECM) detects an injec-
tor code that is incorrect for the engine.
The warning lamp will come on.
(continued)
UENR4469-36 343
Circuit Tests
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