Preliminary Inspection

CAUTION: If engine is misfiring or fails to start within 12 seconds, the cause must be rectified. Failure to do so will result in irreparable damage to the catalysts. After rectification, the engine must be run at 1500 rpm (no load) for 3 minutes to purge any accumulation of fuel in the system.

ENGINE CONTROL MODULE CIRCUIT DIAGNOSIS
Circuit fault diagnosis may be carried out on all vehicles using a good quality multimeter or the hand held tester RTC6834. The tester displays the fault code and guides the operator by visual prompts, through a series of diagnostic checks. Full operational and diagnosis instructions are provided with the unit memory card.

Which ever instrument is used to diagnose the problem, the following preliminary checks must be carried out first.

PRELIMINARY CHECKS
1. Check that the inertia fuel shut off switch is not tripped.
2. Check fuse D in main fuse panel and the fuel pump fuse in the auxiliary fusebox.
3. Check for ample fuel in tank.
4. Check air inlet system for possible leaks into the inlet manifold.
5. Check HT cables for correct firing order and routing.
6. Check Ignition Timing.

Only when the checks have been carried out, should circuit diagnosis begin.