Engine fails to start,quick test with test lamp
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Engine fails to start,
quick test with test lamp
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1.
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Check the following
fuses:
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maxi fuse no. 2 (+30 supply to ECM, main relay
and fuel pump relay)
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32 (fuel pump relay supply to fuel pump)
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16B (main relay supply to injectors and ignition discharge
module)
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2.
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Ignition switched on. Check that the malfunction indicator lamp (CHECK
ENGINE) lights up with a steady glow for approx. 3 seonds. Also check the fuel
level.
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if the malfunction indicator lamp is not lit, there is no
+15 supply to the ECM
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if the malfunction indicator lamp is lit dimly or flashes, there is no +30 supply
or ground to the ECM (in this fault a buzzing sound can also be heard from the main and fuel
pump relays at the same time as the tachometer is moving upwards on the
scale)
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3.
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The main relay supplies the injectors and ignition discharge module with
power. The function of the main relay should therefore be checked as follows:
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Connect the test lamp to the connector of the IAC
valve
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Switch off the ignition and remove fuse 28 for 5 seconds
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ignition switched on - check that the test lamp is lit for approx. 6 seconds and
then goes out. If this does not happen, see "Fault diagnosis, main relay".
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when the test lamp has gone out, run the starter motor, the test lamp must then
light up again. If not, the ECM does not have information from the crankshaft position sensor,
see "Fault diagnosis, crankshaft position sensor"
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4.
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The fuel pump relay supplies the fuel pump with power. The function of
the fuel pump relay should therefore be checked as follows:
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Switch off the ignition and remove fuse 28 for 5
seconds
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ignition switched on - listen to find out whether the fuel pump is working. The fuel
pump must operate for approx. 2 seconds. If this does not happen, see "Fault diagnosis, fuel
pump relay".
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5.
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Check the following:
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as described in 3, that the power supply from the main
relay reaches the ignition discharge module and injectors. If this does not happen, carry out
fault diagnosis on the leads to crimped connection J67.
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that the ignition discharge module produces sparks. If this does not happen, see
"Fault diagnosis, ignition"
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that there is fuel pressure. If this is not the case, see Service Manual "2:3 Fuel
and induction system"
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