TEST
ACTION
APPLICABILITY
1
NOTE: 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 DRBIII
t, read the engine DTCs. Check and repair all engine DTCs prior to
performing transmission symptom diagnostics.
With the DRBIII
t, 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 DRBIII
t, erase DTCs.
With the DRBIII
t, perform the Solenoid Test.
With the DRBIII
t, read DTCs.
Did the DTC, 1-2/4-5 SOLENOID CIRCUIT, reset?
All
Yes
→ Go To 3
No
→ Go To 7
3
Turn the ignition off to the lock position.
Disconnect the Transmission Control Module C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector
Note: Check connectors - Clean/repair as necessary.
Measure the resistance of the 1-2/4-5 Solenoid Control circuit from the TCM harness
connector to the Transmission Solenoid Assembly harness connector.
Is the resistance above 5.0 ohms?
All
Yes
→ Repair the 1-2/4-5 Solenoid Control circuit for an open.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off to the lock position.
Disconnect the Transmission Control Module C2 harness connector.
Disconnect the Transmission Solenoid Assembly harness connector.
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between ground and the 1-2/4-5 Solenoid Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the 1-2/4-5 Solenoid Control circuit for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST - VER 1.
No
→ Go To 5
25
TRANSMISSION - NAG1
1-2/4-5 SOLENOID CIRCUIT —
Continued