Trouble Shooting/Terracan Intermittent Hard Starting

FIELD CASE STUDY:
MODEL: TERRACAN 2004 (HP)
displacement: 3500 cc
fuel :DIESEL
SUBJECT: INTERMITTENT HARD STARTING – FUEL PUMP RELAY
1.) CONDITION

1. Intermittent hard starting.

2.) CAUSE

1. Fuel pump relay.

3.) DIAGNOSIS

1. Scan tool check

• Diagnostic Trouble code – no trouble appeared in G –Scan

2. Check if there is any spark in IG coil system – normal.
3. To check the fuel line, inspect the sound of the fuel pump at IG key start.
- no sound.
4.Supply ( + ) terminal power source to the fuel pump terminal ( # 15 ) that is in multipurpose
connector.
- Fuel pump operation sound is found – No trouble in the pump.
- Possible to start the engine.
5) After removing the fuel pump relay, check condition of power and connection using test lamp
- Normal.
6. Check the fuel pump relay, (Supplied electric power to the coil.)
- Poor opperation of the fuel pump relay.
7. Check parts of the fuel pump relay
- Poor contact of the fuel pump relay.
4) Repair guide
= Replace the fuel pump relay. 
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