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P0888-RELAY OUTPUT ALWAYS OFF —
TEST
5
Turn the ignition off to the lock position.
Install a substitute Relay in place of the Transmission Control Relay.
Ignition on, engine not running.
With the DRBIII in Transmission Sensors, read the Switched Battery voltage.
Does the Switched Battery voltage read battery voltage?
Yes → Replace the Transmission Control Relay.
→ Go To 6
No
6
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Note: Check connectors - Clean/repair as necessary.
Using a 12-volt test light connected to 12-volts, check the Transmission Control Relay
Ground circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?
Yes → Go To 7
→ Repair the Transmission Control Relay Ground circuit for an
No
7
Turn the ignition off to the lock position.
Remove the Transmission Control Relay.
Disconnect the PCM harness connector.
Note: Check connectors - Clean/repair as necessary.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Transmission Control Relay Control circuit between
the Transmission Control Relay connector and the appropriate terminal of special
tool #8815.
Is the resistance above 5.0 ohms?
Yes → Repair the Transmission Control Relay Control circuit for an
→ Go To 8
No
ACTION
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
open.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
open.
Perform 41TE (NGC) TRANSMISSION VERIFICATION TEST -
VER 1.
TRANSMISSION - NGC
Continued
113
APPLICABILITY
All
All
All
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