Part 1

Faulty signal

EFI-436 Rear heated oxygen sensor (HO2S), compensation

Checking compression

Checking compression

Checking the compression
- Carry out a compression check as per Compression test Compression Test.

Is the compression in any cylinder incorrect?

Yes - Rectify as necessary.
Fault tracing information

No - No Fault Found

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Fault tracing information
- Rectify as necessary.

Press Continue when fault is repaired.

Continue - FAULT FOUND

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No Fault Found - Checking for air leakage

FAULT FOUND - Verification

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Checking for air leakage

Checking for air leakage

Checking for air leakage in the intake system
- Check if there is any air leakage as per.

Is there any air leakage?

Yes - Rectify as necessary.
Fault tracing information

No - Checking for air leakage in the exhaust system

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Fault tracing information
- Rectify as necessary.

Press Continue when fault is repaired.

Continue - FAULT FOUND

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Checking for air leakage in the exhaust system
- Check if there is any air leakage.

Is there any air leakage?

Yes - Rectify as necessary.
Fault tracing information

No - No Fault Found

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No Fault Found - Checking fuel and residual pressure
Checking fuel and residual pressures

FAULT FOUND - Verification

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Checking fuel and residual pressure

Fuel pressure and residual pressure
981 2270 PUMP TROLLEY 981 2270 Pump Trolley 981 2273 PUMP 981 2273 Pump 981 2282 Tank 981 2282 Tank 998 9725 Adapter 998 9725 Adapter 999 5011 MANOMETER 999 5011 Manometer
Checking the fuel pump relay's two-stage function

Check the fuel pump relay's two-stage function

Check the fuel pump relay's two-stage function

- Ignition off.
- Remove fuse no. 2.

- Ignition off.
- Remove the cover from the central electrical unit.
- Remove the fuel pump relay (pos. 103 in the central electrical unit)
- Connect a lead between the relay connector 1 and 3.
- Ignition on.

- Check that the fuel pump is working by gently squeezing the hose leading to the fuel pressure regulator.
- A slight pulsating sensation is felt if the fuel pump is working.

Is the fuel pump working?

Yes -

No - Check the lead between the fuel pump relay connector 3 and the fuel pump connector 1 for signs of a break as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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Checking for open-circuit

- Check the lead between the fuel pump relay connector 3 and the fuel pump connector 1 for signs of a break 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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Checking half-speed

- Ignition off.
- Remove the lead linking connector 1 and 3 on the fuel pump relay connector.
- Connect the lead between the relay coupling's connector 1 and 5.
- Ignition on.

- Check that the fuel pump is working by gently squeezing the hose leading to the fuel pressure regulator.
- A slight pulsating sensation is felt if the pump is working.

Is the fuel pump working?

Yes - Test with a new fuel pump relay.

No -

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Replacement of component
- Test with a new fuel pump relay.

Press Continue when fault is repaired.

Continue -

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Check the lead between the relay and the series resistance.

- Ignition off.
- Remove the windshield wiper arms.
- Remove the plenum cover.
- Disconnect the series resistance.
- Connect the lead between relay coupling connectors 1 and 5.
- Ignition on.

- Connect a voltmeter between the series resistance's connector 2 (to fuel pump relay) and ground.

The voltmeter should show battery voltage.

OK -

Not OK - Check the lead between the fuel pump relay connector 5 and the series resistance, connector 2, for signs of a break as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

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Checking for open-circuit

- Check the lead between the fuel pump relay connector 5 and the series resistance, connector 2, for signs of a break 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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Check the series resistance

- Ignition off.
- Series resistance disconnected.

- Connect an ohmmeter between the series resistance's coupling 1 and 2 (to series resistance).

The ohmmeter should show approx. 0.9 W.

OK - Check the lead between the series resistance connector 1 and fuel pump connector 1 for signs of a break as per Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.

Not OK - Test with a new series resistance.

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Checking for open-circuit

- Check the lead between the series resistance connector 1 and fuel pump connector 1 for signs of a break 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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Replacement of component
- Test with a new series resistance.

Press Continue.

Continue -

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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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Verification

Hint: After repair, it is necessary to check that the fault has been corrected.
Perform as follows:

- Ignition off.
- Reconnect connectors, components etc.
- Remove fuse no. 2.

- Connect a Fluke multimeter (or equivalent), set to measure DC, between fuse no. 2's tabs in the fuse-holder.

Note! The VIDA station could not be used in this measurement.

- Start the engine

Rev. the engine; at speeds above 3000 rpm, current consumption should be higher than at speeds below 3000 rpm.

OK - FAULT FOUND

Not OK -

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No Fault Found -

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Fuel pressure and residual pressure

Checking fuel pressure and residual pressure
981 2270 PUMP TROLLEY 981 2270 Pump Trolley 981 2273 PUMP 981 2273 Pump 981 2282 Tank 981 2282 Tank 998 9725 Adapter 998 9725 Adapter 999 5011 MANOMETER 999 5011 Manometer 999 5479 ADAPTER 999 5479 Adapter 999 5843 VACUUM PUMP AT 999 5843 Vacuum Pump AT 998 5496 ENGINE COOLANT SYSTEM - PRESSURE TESTER 998 5496 Engine Coolant System - Pressure Tester 999 5230 PRESSURE METER 999 5230 Pressure Meter
Choosing a method for taking a reading
It is possible to measure fuel pressure with the car stationary or while being driven. Residual pressure is measured with the car stationary.

Continue - Checking vacuum hose to pressure regulator

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Checking vacuum hose to pressure regulator
- Ignition off.
- Remove throttle pulley cover.
- Disconnect vacuum hose from pressure regulator.
- Check that the hose is not blocked by blowing into it.

Is the hose OK?

Yes - Connect pressure gauge

No - Checking hose and connection

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Checking hose and connection
- Check hose and terminal on intake manifold, clean/replace.

Select "Continue" when the fault has been repaired.

Continue - Connect pressure gauge

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Connect pressure gauge
- Supplement pressure gauge 999 5011 MANOMETER 999 5011 Manometer with nipple 998 9725 Adapter 998 9725 Adapter and adapter 999 5479 ADAPTER 999 5479 Adapter before use.
- Connect adapter to valve on fuel rail, with adapter in locked position (valve closed as in picture 1).
- Turn pressure gauge cock so it faces adapter 999 5479 ADAPTER 999 5479 Adapter.
- Connect other pressure gauge connector to fuel draining unit 981 2270 PUMP TROLLEY 981 2270 Pump Trolley , 981 2273 PUMP 981 2273 Pump and 981 2282 Tank 981 2282 Tank.
- Unlock adapter (illustration 2 valve open).

Continue - Starting fuel pump (FP)

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Starting fuel pump (FP)

- Remove central electrical unit cover.
- Remove fuel pump relay (position 103 in electrical distribution unit).
- Connect a cable between relay base terminals 1 and 3.
- Ignition on.

Fuel pump (FP) should operate.

Continue - Measuring line pressure

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Measuring line pressure
- Read off line pressure from pressure gauge.

Line pressure should be 300 kPa (3.0 kp/cm2).

OK - Checking fuel filter

Low - Line pressure too low

High - Line pressure too high

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Line pressure too high

- Ignition off.
- Remove the cable between the relay base terminals 1 and 3.
- Disconnect return line from pressure regulator.

- Blow through the line into the fuel tank.

Is cable OK?

Yes - Measuring line pressure, Stop fuel pump

No - Measuring line pressure, Checking for blockage

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Stop fuel pump

- Switch off ignition.
- Disconnect jumper lead between relay base terminals 1 and 3.

Continue - Replacing component

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