Part 2
Checking diagnostic trouble codes (DTCs) (Continued)
Checking the component
- Ignition off.
- Control unit disconnected.
- Disconnect the engine control unit.
- Access the combined instrument as described in.
- Connect an ohmmeter between control unit connection 8S and combined instrument connection A:7.
The resistance should be 0 ohms
OK - Checking for a short circuit
Not OK - Checking for an open circuit
-------------------------------------------------
Checking for a short circuit
- Ignition off.
- Check the wire between control unit connection 8S and combined instrument connection A7 as well as the wire between engine control module connection B18 and combined instrument connection A7 for a short circuit to ground as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select Continue when fault has been rectified.
Continue - FAULT FOUND
-------------------------------------------------
Checking for an open circuit
- Ignition off.
- Check the lead between the combined instrument connector pin A7 and control unit connector pin 8S for an open circuit as described in Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Select Continue when fault has been rectified.
Continue - FAULT FOUND
-------------------------------------------------
FAULT FOUND - Information
No Fault Found - Information
FAULT-TRACING FAILED - Information
-------------------------------------------------
Fault-tracing diagnostic trouble code (DTC) 1-2-2
Signal faulty
FAULT FOUND - Information
No Fault Found - Information
FAULT-TRACING FAILED - Information
-------------------------------------------------
Fault-tracing diagnostic trouble code (DTC) 2-1-1
Internal fault
Replacing component
- Ignition off.
- Try a new control module according to Replacing control module Service and Repair.
Continue - FAULT FOUND
------------------------
FAULT FOUND - Information
No Fault Found - Information
FAULT-TRACING FAILED - Information
-------------------------------------------------
Fault-tracing diagnostic trouble code (DTC) 2-1-2
Faulty signal
Checking the vacuum system
Connection
Connection of Volvo Scan Tool (ST)
Volvo ST must be connected to both VIDA PC and vehicle to DLC in passenger compartment (models 1996-) or DLC B (models -1995).
Is Volvo ST connected and switched ON?
Yes - FAULT FOUND
No - No Fault Found
------------------------
FAULT FOUND - Checking vacuum supply pipe
-------------------------------------------------
Checking vacuum supply pipe
Check the vacuum supply pipe in the area of the left front headlight.
Is the vacuum supply pipe OK?
Yes - Checking ground lead and power supply
No - Repair of component
-------------------------------------------------
Repair of component
Repair vacuum supply pipe in the area of the left front headlight according to Repair of vacuum pipe Service and Repair.
Continue - FAULT FOUND
-------------------------------------------------
Checking ground lead and power supply
- Ignition on.
- Try to establish communication with the cruise control control module.
Was communication established with the cruise control control module?
Yes - Checking regulator function
No - No Fault Found
-------------------------------------------------
Checking regulator function
- Ignition off.
- Remove central electrical unit cover.
- Disconnect control module.
- Ignition on.
Connect the single cable between control module connector terminal 1S and terminal 7T.
Connect the other cable with the double blade terminal to control module connector terminal 3S, connect one end of the cable to the control module connector terminal 9S.
The regulator should click.
Did the regulator click?
Yes - Checking vacuum pump function
No - Checking cable to the regulator
-------------------------------------------------
Checking cable to the regulator
- Ignition off.
- Control module disconnected.
- Disconnect battery leads from the battery.
- Remove battery and battery shelf.
- Disconnect vacuum pump.
- Connect battery leads to battery.
Connect an ohmmeter between vacuum pump connector terminal 1 and ground.
Resistance should be infinite.
OK - Checking power supply to regulator
Not OK - Checking for a short-circuit
-------------------------------------------------
Checking for a short-circuit
- Ignition off.
- Check cable between vacuum pump connector terminal 1 and control module connector terminal 9S for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification, regulator
-------------------------------------------------
Checking power supply to regulator
- Ignition off.
- Control module connected.
- Vacuum pump disconnected.
- Ignition on.
Connect a voltmeter between vacuum pump connector terminal 1 and ground.
The voltmeter should read approx. 10 V.
OK - Checking cable to the vacuum pump
Not OK - Checking for an open-circuit
-------------------------------------------------
Checking for an open-circuit
- Ignition off.
- Check cable between vacuum pump connector terminal 1 and control module connector terminal 9S for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification, regulator
-------------------------------------------------
Checking cable to the vacuum pump
- Ignition off.
- Disconnect control module.
- Vacuum pump disconnected.
Connect an ohmmeter between vacuum pump connector terminal 3 and ground.
Resistance should be infinite.
OK - Checking power supply to vacuum pump
Not OK - Checking for a short-circuit
-------------------------------------------------
Checking for a short-circuit
- Ignition off.
- Check cable between vacuum pump connector terminal 3 and control module connector terminal 7T for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification, regulator
-------------------------------------------------
Checking power supply to vacuum pump
- Ignition off.
- Connect control module.
- Vacuum pump disconnected.
- Ignition on.
Connect a voltmeter between vacuum pump connector terminal 3 and ground.
The voltmeter should read approx. 0 V.
OK - Checking cable resistance
Not OK - Checking for a short-circuit
-------------------------------------------------
Checking for a short-circuit
- Ignition off.
- Check cable between vacuum pump connector terminal 3 and control module connector terminal 7T for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification, regulator
-------------------------------------------------
Checking cable resistance
- Ignition off.
- Disconnect control module.
- Vacuum pump disconnected.
Connect an ohmmeter between vacuum pump connector terminal 3 and control module connector terminal 7T.
The ohmmeter should read approx. 0 ohms.
OK - Checking the regulator
Not OK - Checking for an open-circuit
-------------------------------------------------
Checking for an open-circuit
- Ignition off.
- Check cable between vacuum pump connector terminal 3 and control module connector terminal 7T for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification, regulator
-------------------------------------------------