HF. Problems Starting When Warm

HF. Problems Starting When Warm

Fault tracing conditions
Any DTCs must be remedied. The engine should be warm. The fault is not intermittent (See HH. Intermittent starting problems). HH. Intermittent Starting Problems

HF1




Injector Pulses
Connect a voltmeter between terminals 1 and 2 on one of the injectors.
- Operate the starter motor.
The voltmeter should read 200-400 mV.

If this value is OK
^ Check the RPM sensor HF2.

If the reading is incorrect
^ Check the engine temperature sensor HF3.

HF2




Checking The RPM Sensor
- Ignition off.
Connect an ohmmeter between terminals 1 and 2 on the RPM sensor.

RPM sensor 1 389 567-7 (early models):
The ohmmeter should read approx. 240 ohms at 20°C (68°F) and a maximum of 400 ohms when the engine is warm.

RPM sensor 3 547 847-8 (later models):
The ohmmeter should read approx. 170 ohms at 20°C (68°F) and a maximum of 350 ohms when the engine is warm.

If this value is OK
^ Check the fuel pressure and residual pressure HF4.

If the reading is incorrect
^ Try using a new RPM sensor.

HF3




Checking The Engine Coolant Temperature (ECT) Sensor
Carry out fault tracing in accordance with ED. DTC 1-2-3. Engine temp. sensor signal absent or faulty. DTC 1-2-3

If no faults are found
^ Return to A. How fault tracing is carried out. A. Fault Tracing Chart

HF4




Checking The Fuel Pressure And Residual Pressure
Check the fuel pressure and residual pressure in accordance with X. Fuel Pressure and Residual Pressure. X. Fuel Pressure and Residual Pressure

If fuel pressure and residual pressure are OK
^ Return to A. How fault tracing is carried out. A. Fault Tracing Chart