Illustration 185 g02061279
Power terminals at the service tool connector
(Terminal A) +Battery
(Terminal B) −Battery
Table 242
Troubleshooting Test Steps
Values Results
5. Check the Electrical Power to the Communication Adapter
A. Check for battery voltage at the diagnostic connector.
Electrical
Power
Result: Battery voltage is not present at the diagnostic
connector.
Repair: Inspect the vehicles wiring and fuses. Determine the
cause of the missing voltage. Make the necessary repairs.
Attempt to establish communication after the electrical
power is at the service tool connector.
If the service tool does not communicate on both data links,
proceed to Test Step 6.
Result: The electronic service tool indicates that the engine
is serviced on both links.
Repair: Verify that the cable between the diagnostic connec-
tor and the communication adapter is OK. If necessary, re-
place the cable.
Repair: Replace the communication adapter if the following
conditions are true:
1. There is power at the cables “DATA LINK” connector.
2. The communication adapters “POWER” indicator is not
illuminated.
6. Check the Electrical Power to the ECM
A. Verify that the keyswitch is ON.
B. Check the voltage between the “Battery+” terminals and the
“Battery-” terminals on the P1 ECM connector.
C. Check the voltage between the “Keyswitch” terminal and a “Bat-
tery-” terminal on the P1 ECM connector.
Electrical
Power
Result: Battery voltage is missing from a P1 terminal.
Repair: Inspect the vehicles wiring and fuses. Determine the
cause of the missing voltage. Make the necessary repairs.
Attempt to establish communication after the electrical
power is at all of the appropriate P1 terminals. Continue with
this procedure, if necessary.
Result: Battery voltage is present at all of the appropriate
P1 terminals.
Contact the Dealer Solutions Network (DSN).
504 UENR4469-36
Service
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