Quick On Start Preheating System, Checking Diagnosis
This procedure is not and is not meant to be, exhaustive and as such should only be used as a guideline to the most probable sequence and possible failure modes.
The following is a fuller description of column titles:
Vehicle Status:
The operational state of the vehicle and particularly the engine. Whether the ignition is switched on and if the engine is running etc.
70°C:
The temperature of the engine coolant, either above or below 70°C/158°F.
Indication:
Reference to the action of either the glow indicator or one of the relays.
OK:
If Yes then action of indicator or relay is correct, no further operations are required on this path.
If No then proceed to Check Item and from there to Troubleshooting.
Check Item:
Refers to main item to be checked, whether the item is working properly. Proceed to either OK No or OK Yes.
OK:
Either Yes or No, proceed to relevant item in Troubleshooting.
Troubleshooting:
Guideline to the most probable sequence and possible failure.
| Vehicle Status | 70°C | Indication | OK | Check Item | OK | Trouble Shooting |
|---|---|---|---|---|---|---|
| Enginestationaryignition on | ||||||
| Above or Below | ||||||
| Glow indicator onfor 6 seconds | ||||||
| No | ||||||
| Check bulb |
No
| Yes | Replace bulbCheck harness connections | |||||
|---|---|---|---|---|---|---|
| Replace controller | ||||||
| Glow relay No.1closed for 9 seconds | No | Check relay foroperation | No | Replace relay | ||
| Yes | Check harness connectionsreplace controller | |||||
| Engine startedafter glow | Above or | Glow relay No.1closed for 13 seconds | No | Check relay foroperation | No | Replace relay |
| indicator goes out | Below | Yes | Check harness connectionsreplace controller | |||
| Below | Glow relay No.2 closesand remains engaged for180 seconds after | No | Check relay foroperation | No | Replace relay | |
| engine start | Yes | Check harness connections | ||||
| Check charge relay circuit | ||||||
| Above | Glow relay No.2 closes | Check thermo sensor | ||||
| for 3 - 4 seconds | Replace controller | |||||
| Engine started | Above | Glow indicator on | No | Check bulb | No | Replace bulb |
| before glow | or | for 6 seconds | ||||
| indicator goes out | Below | |||||
| Yes | Check harness connectionsReplace controller | |||||
| Glow relay No.1 | No | Check relay for | No | Replace relay | ||
| closed for 13 seconds | operation | |||||
| Yes | Check harness connectionsReplace controller | |||||
| Below | Glow relay No.2 closes | No | Check relay for | No | Replace relay | |
| and remains engaged for | operation | |||||
| 180 seconds after | ||||||
| engine start. | Yes | Check harness connections | ||||
| Check charge relay circuit | ||||||
| Above | Glow relay No.2 closes | Check thermo sensor | ||||
| for 6-7 seconds | Replace controller |