TEST ACTION APPLICABILITY
2 Turn the ignition off to the lock position.
Disconnect the Transmission Solenoid Assembly harness connector.
Start the engine.
With the brakes firmly applied, shift the gear selector into Drive.
Did the engine stall or stumble?All
Ye s!Repair the internal transmission. Pay particular attention to the
components related to the TCC. Refer to the Service Information
for the proper repair procedure.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 3
3 Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.
Measure the resistance between ground and the TCC Solenoid Control circuit.
Is the resistance below 5.0 ohms?All
Ye s!Repair the TCC Solenoid Control circuit for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 4
4 Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
Disconnect the Transmission Solenoid harness connector.
Measure the resistance of the TCC Solenoid Control circuit to all other circuits in the
Transmission Solenoid harness connector.
Is the resistance below 5.0 ohms on any circuit?All
Ye s!Repair the TCC Solenoid Control circuit for a short to other
circuits.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
11 6
TRANSMISSION - NAG1
TCC STUCK ON ÐContinued
TEST ACTION APPLICABILITY
7 Turn the ignition off to the lock position.
Disconnect the TCM C1 and C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.
Measure the resistance between the Temp Sensor - P/N Switch circuit and all other
circuits in the TCM C1 and C2 harness connector.
Is the resistance below 5.0 ohms on any circuit?All
Ye s!Repair the Transmission Temp Sensor - P/N Switch circuit for a
short to other circuits.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 8
8 Turn the ignition off to the lock position.
Disconnect the TCM C2 harness connector.
NOTE: Make sure the Transmission Solenoid Assembly harness connector is
connected or the results of the test will be invalid.
With the brakes firmly applied, place the gear selector in Drive.
Measure the resistance between the Temp Sensor - P/N Switch circuit and the Sensor
Ground circuit in the TCM C2 harness connector.
Is the resistance between 500 and 2500 ohms?All
Ye s!Replace the Transmission Control Module.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Replace the Temp Sensor - P/N Switch Assembly per the Service
Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
11 9
TRANSMISSION - NAG1
TRANS TEMP SENSOR - P/N SWITCH CIRCUIT ÐContinued
Symptom:
TRANS TEMP SENSOR ERRATIC
When Monitored and Set Condition:
TRANS TEMP SENSOR ERRATIC
When Monitored: When transmission temperature is below 170É C (338É F)
Set Condition: When there is a 10É C (18É F) variation between each transmission
temperature sensor read. If the DTC is reset (after an ignition cycle), the DTC will be set
to Stored (Intermittent) status.
POSSIBLE CAUSES
TRANSMISSION TEMP SENSOR WIRING
TCM - TRANS TEMP SENSOR ERRATIC
TEST ACTION APPLICABILITY
1NOTE: Low fluid level can be the cause of many transmission problems. If
the fluid level is low locate and repair the leak then check and adjust the
fluid level per the service information.
NOTE: Always perform diagnostics with a fully charged battery to avoid
false symptoms.
With the DRBIIIt, read the engine DTCs. Check and repair all engine DTCs prior to
performing transmission symptom diagnostics.
With the DRBIIIt, read and record all Transmission DTCs.
NOTE: Check connectors - Clean/repair as necessary. Poor pin to terminal
connections can set DTCs.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
Repair as necessary.
Most DTCs set on start up but some must be set by driving the vehicle such that all
diagnostic monitors have run.
Note: Verify flash level of transmission controller. Some problems are
corrected by software upgrades to the transmission controller.
NOTE: Check for any Technical Service Bulletins that may apply.
Perform this procedure prior to Symptom diagnosis.All
Continue
Go To 2
2 Ignition on, engine not running.
With the DRBIIIt, monitor the Transmission Temperature.
With the brakes firmly applied, place the gear selector in Drive.
While monitoring the DRBIIIt, wiggle the wires and connectors from the TCM to the
Transmission Solenoid Assembly.
Did the Transmission Temperature fluctuate while wiggling the wires?All
Ye s!Repair the wiring and/or connectors as necessary.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No!Go To 3
120
TRANSMISSION - NAG1
