Signal Too Low. Permanent Fault
Signal too low. Permanent fault
EFI-445 Pulsed secondary air injection system (PAIR) pump, signal.
Checking power cable
- Ignition off.
- Remove the power cable from relay.
Connect a voltmeter between relay connector A and ground.
The voltmeter should read battery voltage.
OK - Checking signal cable resistance
Not OK - There is an integrated fusible link in the cable between the battery and relay. If there is an open-circuit in this cable there is probably a short-circuit to ground in the circuit which caused the open-circuit. Check the relay and pulsed secondary air injection system (PAIR) pump before replacing the cable. Check cable between battery and pulsed secondary air injection system (PAIR) pump relay terminal A1 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for an open-circuit
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Checking for an open-circuit
- There is an integrated fusible link in the cable between the battery and relay. If there is an open-circuit in this cable there is probably a short-circuit to ground in the circuit which caused the open-circuit. Check the relay and pulsed secondary air injection system (PAIR) pump before replacing the cable. Check cable between battery and pulsed secondary air injection system (PAIR) pump relay terminal A1 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 signal cable resistance
- Ignition off.
- Disconnect signal cable from relay, connector B.
Connect an ohmmeter between relay connector B terminal 1 and ground.
The ohmmeter should read infinite resistance.
OK - Checking ground terminals
Checking the signal cable
Not OK - Checking for an open-circuit
Check signal cable between pulsed secondary air injection system (PAIR) pump relay connector B terminal 1 and engine control module (ECM) #B38 for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
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Checking for an open-circuit
- Check signal cable between pulsed secondary air injection system (PAIR) pump relay connector B terminal 1 and engine control module (ECM) #B38 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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Checking ground terminals
Connector A
951 1351 ADAPTOR 86-PIN 951 1351 Adaptor 86-Pin 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428
Connecting up the Test box to Motronic 4.3
Is the test box connected to the control module?
Yes - FAULT FOUND
No -
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Connection of break-out box to connector A (black)
- Switch off ignition.
- Disconnect ECM.
Note! The ECM must not be removed from the car until the main relay has interrupted the supply. This may take up to 150 seconds after the ignition has been switched off.
- Plug adapter 951 1351 ADAPTOR 86-PIN 951 1351 Adaptor 86-Pin into ECM base and connect break-out box 981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to adapter.
Press Continue.
Continue -
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Checking ground terminals
- Switch off ignition.
- Switch off all power consumers, such as interior lighting and radio.
- Use ohmmeter to measure resistance between battery negative terminal and
- #13 (#A13) on break-out box
- #28 (#A28) on break-out box
- #42 (#A42) on break-out box
Instrument should indicate approx. 0 ohms in all cases.
OK - Resume fault tracing at point of interruption.
No Fault Found
Not OK - Check ground terminals 31/32 and 31/33 at rear of engine and associated wiring for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.Check ground lead between engine and chassis for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
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Checking for open-circuit, contact resistance and oxidation
- Check ground terminals 31/32 and 31/33 at rear of engine and associated wiring for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
- Check ground lead between engine and chassis for open-circuit as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault , and for contact resistance and oxidation as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Press Continue when fault is repaired.
Continue -
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Verification
Hint: After repair, it is necessary to check that the fault has been corrected.
Perform as described below.
- Switch off ignition.
- Switch off all power consumers, such as interior lighting and radio.
- Use ohmmeter to measure resistance between battery negative terminal and
- #13 (#A13) on break-out box
- #28 (#A28) on break-out box
- #42 (#A42) on break-out box
Instrument should indicate approx. 0 ohms in all cases.
OK - FAULT FOUND
Not OK -
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Troubleshooting 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 -
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FAULT FOUND - Checking the signal cable
No Fault Found - Checking the signal cable
FAULT-TRACING FAILED - Checking the signal cable
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Checking the signal cable
- Ignition off.
- Breakout box connected.
- Signal cable disconnected from pulsed secondary air injection system (PAIR) pump relay.
Connect an ohmmeter between relay connector B terminal 1 and ground.
The ohmmeter should read approximately 0 ohms.
OK - Checking pulsed secondary air injection system (PAIR) pump relay
Not OK - Checking for an open-circuit
Check signal cable between pulsed secondary air injection system (PAIR) pump relay terminal B1 and engine control module (ECM) #B38 for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
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Checking for an open-circuit
- Check signal cable between pulsed secondary air injection system (PAIR) pump relay terminal B1 and engine control module (ECM) #B38 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 pulsed secondary air injection system (PAIR) pump relay
- Ignition off.
- Reconnect all cables to the pulsed secondary air injection system (PAIR) pump relay.
- Ignition on.
- Select Volvo Scan Tool (ST) to activate pulsed secondary air injection system (PAIR) pump.
Does the pulsed secondary air injection system (PAIR) pump start?
Yes - The diagnostic trouble code (DTC) has been caused by poor contact in the pulsed secondary air injection system (PAIR) pump relay connectors. Check connectors for contact resistance and oxidation and remedy in accordance with Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Then continue with Verification.
Checking for contact resistance and oxidation
No - Try a new pulsed secondary air injection system (PAIR) pump relay. Then continue with Verification.
Replacing component
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Checking for contact resistance and oxidation
The diagnostic trouble code (DTC) has been caused by poor contact in the pulsed secondary air injection system (PAIR) pump relay connector.
- Check connector for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Continue - Verification
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Replacing component
- Try a new pulsed secondary air injection system (PAIR) pump relay.
Continue - Verification
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Verification
Verification
Hint: After carrying out the repair, check that the fault has been remedied as follows:
- Ignition on.
- Select Volvo Scan Tool (ST) to activate pulsed secondary air injection system (PAIR) pump.
A "clicking sound" should be heard from the relay and the pulsed secondary air injection system (PAIR) pump should start.
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 have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking power cable
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