TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the AMBIENT/BATT harness Connector.
Note: Check connectors - Clean/repair as necessary.
Connect a jumper across the Terminals of the AMBIENT/BATT (harness side).
Ignition on, engine not running.
With the DRBIII
t in Inputs/Outputs, read the AMBIENT/BATT voltage.
Is the voltage reading equal to zero?
All
Yes
→
Replace the AMBIENT/BATT temperature sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Go To
4
4
Ignition on, engine not running.
Record all DTC’s and freeze frame data, now erase Codes.
Carefully inspect all Connectors for corrosion or spread Terminals before continuing.
With the DRBIII
t actuate the Generator Field Driver Circuit.
Backprobe the Generator Field Source (+) Circuit at back of Generator.
Is the voltage above 10.0 volts?
All
Yes
→
Go To
5
No
→
Repair the open Generator Field Source (+) Circuit from Gener-
ator.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
5
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Generator Field harness connector.
Note: Check Connectors - Clean/repair as necessary.
Measure the Generator Field Driver Circuit from PCM to Generator.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
6
No
→
Repair the open Generator Field Driver Circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
6
Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the generator field harness connector.
Measure the Generator Field Source Circuit from PCM harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Generator Field Source Circuit shorted to ground and
replace PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Go To
7
7
Turn the ignition off.
Disconnect the PCM harness connector(s).
Disconnect the Generator Field harness connector.
Measure the Generator Field Driver Circuit from PCM Connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the Generator Field Driver Circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 3.
No
→
Go To
8
25
CHARGING
P1682-CHARGING SYSTEM VOLTAGE TOO LOW —
Continued