Part 4
Checking disengagement cause (Continued)
Checking for a short-circuit
- Ignition off.
- Check cable between control module connector terminal 9T and brake valve terminal 1 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
On cars with a manual transmission check cable between control module connector terminal 9T and clutch valve connector terminal 1 for a short-circuit to supply voltage according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Checking cable between brake/clutch valve and control module
- Ignition off.
- Control module disconnected.
- Disconnect brake valve.
- Clutch valve connected (manual transmission).
- Connect an ohmmeter between control module connector terminal 9T and brake valve connector terminal 1.
On cars with a manual transmission the ohmmeter should be connected to clutch valve connector terminal 1.
The ohmmeter should read approx. 0 ohms.
OK - Checking control module connector
Not OK - Checking for an open-circuit
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Checking for an open-circuit
- Ignition off.
- Check cable between control module terminal 9T and brake valve connector terminal 1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
On cars with a manual transmission check cable between control module connector terminal 9T and clutch valve connector terminal 1 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 control module connector
- Ignition off.
- Check control module connector terminal 9T for loose connections and remedy according to Checking wiring and terminals. Intermittent faults Checking Wiring and Terminals. Intermittent Faults and contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Connect brake/clutch valve.
- Connect control module.
- Ignition on.
- Activate Diagnostic Test Mode (DTM) 2.
- Move switch from ON to OFF or from OFF to ON.
- Check whether response code 1-1-3 is returned.
Response code 1-1-3 returned?
Yes - Fault-tracing information
No - Replacing component
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Fault-tracing information
- The response code was not returned because of loose connections in the control module connector.
Continue - FAULT FOUND
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Replacing component
- Ignition off.
- Try a new control module according to Replacing control module Service and Repair.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows:
- Ignition off.
- Reconnect connectors, reinstall components.
- Connect control module.
- Connect Volvo Scan Tool (ST) to data link connector (DLC).
- Ignition on.
- Activate Diagnostic Test Mode (DTM) 2.
- Move switch from ON to OFF or from OFF to ON.
- Check whether response code 1-1-3 is returned.
Response code 1-1-3 returned?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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Fault-tracing information
Information
Attempt New Test - Checking response code for ON/OFF switch
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Connection of Volvo Scan Tool (ST)
DONE - Checking response code for ON/OFF switch
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FAULT FOUND - Information
FAULT-TRACING FAILED - Information
No Fault Found - Information
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Fault-tracing response code 1-2-4
Checking the stop (brake) light switch
Connection
FAULT FOUND - Checking response code
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Checking response code
- Ignition on.
- Activate Diagnostic Test Mode (DTM) 2.
- ON/OFF switch to the OFF position
- Depress brake pedal.
- Check that the stop (brake) light switch is OK by checking that response code 1-3-2 is returned.
Response code 1-3-2 returned?
- 1. Yes, response code 1-3-2 is returned.
- 2. No, response code 1-3-2 is not returned.
- 3. No, response code 3-1-1 is returned instead.
Select one of the alternatives above.
1 - No Fault Found
2 - Checking the stop (brake) light
3 - Checking response code 3-1-1
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Checking response code 3-1-1
A response code is returned when the control module receives several input signals from the same component or circuit within 8 ms. The cause of the fault can be loose connections or a defective system component.
Continue - Checking the stop (brake) light
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Checking the stop (brake) light
- Ignition on.
- Depress brake pedal.
Does the stop (brake) light light?
Yes - Checking power supply to control module
No - Checking fuse
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Checking fuse
- Check that fuse 11/12 is intact.
Is the fuse intact?
Yes - Checking 30-supply to fuse
No - Checking for a short-circuit
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Checking for a short-circuit
- Ignition off.
Check cable between:
- fuse 11/12 and stop (brake) light switch connector terminal 1
- stop (brake) light switch connector terminal 2 and stop (brake) lights
- stop (brake) light switch connector terminal 2 and control module connector terminal 6S for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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