Part 1
Short-circuit to ground or open-circuit
Checking solenoid STH
- Ignition on.
- Go into scrolling values.
- Read off the current through the solenoid circuit.
- Depress the accelerator pedal (AP) slowly.
The current should decrease as the accelerator pedal (AP) is depressed.
OK - Intermittent Fault
Not OK - Connecting the breakout box
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Connecting the breakout box
Connecting the breakout box
951 1355 Adapter 42-pin 951 1355 Adapter 42-pin 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Information
Connecting the breakout box to AW50-42
Is the breakout box connected to the control module?
Yes - CONNECTEDReturn to fault-tracing.
No - NOT CONNECTED
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CONNECTED - CONNECTED
NOT CONNECTED - Connecting the breakout box
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Connecting the breakout box
Connecting the breakout box
981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 951 1355 Adapter 42-pin 951 1355 Adapter 42-pin
Connecting the breakout box
Caution! The voltage supply to the control module must be disconnected when disconnecting the breakout box. Failure to observe this procedure could seriously damage the control module.
- Ignition off
- Expose and disconnect the AW50-42 transmission control module (TCM) according to Replacing the transmission control module (TCM) .
- Control module disconnected.
Connect adapter 951 1355 Adapter 42-pin 951 1355 Adapter 42-pin to the control module connector (wiring side). Connect breakout box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the adapter.
Note! Ensure that the adapter is the right way around.
Continue - DONE
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DONE - Checking the ground terminal
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Checking the ground terminal
- Ignition off.
- Control module disconnected.
- Switch off all power consuming equipment, such as courtesy lighting, radio etc.
Connect an ohmmeter between terminal 1 on the breakout box and the battery negative terminal.
The ohmmeter should read approximately 0 ohms.
OK - Return to the fault-tracing procedure where it was interrupted.
No Fault Found
Not OK - Checking for an open-circuit, contact resistance and oxidation
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Checking for an open-circuit, contact resistance and oxidation
Check ground terminal 31/20 and the lead between the ground terminal and control module #1 for open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Check the ground lead between the battery and the body for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Verification
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Verification
Verification
Hint: After repairs have been completed they must be verified as follows to ensure that the fault has been eliminated:
- Ignition off
- Switch off all power consuming equipment, such as courtesy lighting, radio etc.
- Control module disconnected
Connect an ohmmeter between #1 on the breakout box and the battery negative terminal.
The ohmmeter should read approximately 0 ohms.
OK - VERIFIED
Not OK - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.
Do you want to terminate fault-tracing at this time?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Connecting the breakout box
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FAULT FOUND - Fault-tracing information
CONNECTED - Checking the resistance in the circuit for solenoid STH
No Fault Found - Checking the resistance in the circuit for solenoid STH
FAULT-TRACING FAILED - Checking the resistance in the circuit for solenoid STH
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Fault-tracing information
The cause of the diagnostic trouble code (DTC) was a poor power ground.
Continue - Verification
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Checking the resistance in the circuit for solenoid STH
- Ignition off.
- Disconnect the control module.
Connect an ohmmeter between #4 and #16 on the breakout box.
The ohmmeter should read 2-6 ohms.
OK - Checking the circuit for solenoid STH for a short-circuit to ground
Not OK - Checking the resistance in the circuit for solenoid STH in the transmission
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Checking the resistance in the circuit for solenoid STH in the transmission
- Ignition off.
- Disconnect the 6-pin transmission connector.
Connect an ohmmeter between 6-pin transmission connector terminals 1 and 4 (transmission side). For further information about the connectors, see Transmission connectors Transmission Connectors.
The ohmmeter should read 2-6 ohms.
OK - Checking the resistance in the control signal cable
Not OK - Checking the resistance in solenoid STH
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Checking the resistance in solenoid STH
- Ignition off.
- Open the control system according to Replacing control system Service and Repair.
- Disconnect solenoid STH.
Connect an ohmmeter between the pins in the solenoid connector.
The ohmmeter should read 2-6 ohms.
OK - Checking for an open-circuit
Not OK - Replacing the component
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Checking for an open-circuit
Check the wiring between solenoid STH and transmission connector terminals 1 and 4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
When replacing the cable harness, see Inspecting / replacing the cable harness for the solenoids Inspecting / Replacing The Cable Harness For The Solenoids.
Continue - Verification
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Checking the resistance in the control signal cable
- Ignition off.
- 6-pin transmission connector disconnected.
Connect an ohmmeter between transmission connector terminal 1 (control module side) and terminal 16 on the breakout box.
The ohmmeter should read approximately 0 ohms.
OK - Checking the resistance in the signal cable
Not OK - Checking for an open-circuit
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Checking for an open-circuit
Check the cable between transmission connector terminal 1 and control module terminal 16 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Verification
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Checking the resistance in the signal cable
- Ignition off.
- Transmission connector disconnected.
Connect an ohmmeter between transmission connector terminal 4 (control module side) and terminal 4 on the breakout box.
The ohmmeter should read approximately 0 ohms.
OK - Checking for loose connections, contact resistance and oxidation
Not OK - Checking for an open-circuit
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Checking for loose connections, contact resistance and oxidation
The cause of the diagnostic trouble code (DTC) was loose connections in the control module or transmission connectors. Check the connectors for loose connections. Remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring And Terminals. Intermittent Faults. Check for contact resistance and oxidation. Remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Verification
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Checking for an open-circuit
Check the cable between transmission connector terminal 4 and control module terminal 4 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Continue - Verification
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Checking the circuit for solenoid STH for a short-circuit to ground
- Ignition off.
- Control module disconnected.
Connect an ohmmeter between terminal 16 on the breakout box and the transmission housing.
The ohmmeter should read infinite resistance.
OK - Checking the control signal cable for a short-circuit to supply voltage
Not OK - Checking the circuit for solenoid STH in the transmission for a short-circuit to ground
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