Engine fails to start, quicktest
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Engine fails to start, quick
test
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Diagnostic procedure
1. Check the fuses
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Check the following
fuses:
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28 (control module supply, +30 circuit)
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17 (control module supply, +15 circuit)
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32 (fuel pump relay supply to fuel pump)
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16 B (main relay supply to injectors and ignition discharge
module)
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Are the fuses intact?
Continue with point 2.
Change any blown fuses. Then continue with point 2.
2. Check the CHECK ENGINE lamp (MIL)
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Check that the CHECK ENGINE
lamp (MIL) lights up and stays on.
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Is the CHECK ENGINE lamp on?
The control module is activated. Continue with point 3.
No control module supply (+15 circuit). Rectify the fault.
The CHECK ENGINE lamp (MIL) shines weakly or flickers. No control module
supply (+30 circuit) or ground connection. When this fault occurs a buzzing sound can also be
heard from the main and fuel pump relays at the same time as the tachometer needle moves
round the dial. Rectify the fault.
3. Check the main relay
Since the main relay supplies the injectors and ignition discharge module with
power, check its operation as follows:
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Ignition switch in the OFF
position
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Connect the test lamp to pins 10
and 6 of the ignition discharge module's connector.
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Remove fuse 28 for 5
seconds.
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Ignition switch in ON
position
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Check whether the test lamp lights
up for about 6 seconds and then goes out.
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Does the test lamp light up for 6 seconds?
The main relay is OK. Continue with point 4.
Se
4. Run the starter motor when the test lamp has gone out
The test lamp should then light up again.
Test lamp on?
The crankshaft position sensor is OK. Continue with point 5.
The control module receives no information from the crankshaft position
sensor, see
.
5. Check the fuel pump relay
Since the fuel pump relay supplies the fuel pump with power, check the
operation of the fuel pump relay as follows:
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Ignition switch in the OFF
position.
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Remove fuse 28 for 5
seconds.
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Ignition switch in ON
position
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Listen for the sound of the fuel
pump working.
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The fuel pump should run for 2 seconds.
Does the fuel pump work?
The fuel pump relay is OK. Continue with point 6.
Se
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6. Final check
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Check the following: as in point 3,
that the power supplied by the main relay reaches the injectors.
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that the ignition discharge module
produces sparks.
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that fuel pressure is
present.
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Is power supplied to the injectors?
The power supply is OK.
Check the leads up to crimped connection J67.
Does the ignition discharge module produce sparks?
The ignition discharge module is OK.
Se
Is the fuel pressure adequate?
The fuel pump is OK.
See Service Manual 2:3 "Fuel system and air induction system".
