| Test | TECH 1 | Notes | Nominal Values | Possible |
|---|---|---|---|---|
| Step | Display | Trouble | ||
| No. | Codes | |||
| 09 | COOLANT TEMP. | Engine at idle speed | 87 to 114 °C/189 to 237 °F | |
| 1.06 to 0.59 V | 14, 15 |
Trouble-shooting: Nominal Value: Cause of Fault:
(If nominal value is not attained)
Ignition ON
· Remove temperature sensor plug
| 20 XE | C 20 XE |
|---|---|
| 20 XEJ | |
| -39 °C/-38 °F | < -30 °C/-22 °F |
| > 4.9 V | > 4.9 V |
· Short circuit between signal
lead and ground lead in wiring harness
· Control unit defective
· Short circuit both contacts in
temperature sensor plug using
adapter cables from KM-609
| 20 XE | C 20 XE |
|---|---|
| 20 XEJ | |
| >151 °C/304 °F | > 188 °C/370 °F |
| < 0.1 V |
· Lead interruptions from
- Control unit Ter. 45 to temperature sensor
- Temperature sensor to ground
· Control unit defective
If nominal values are attained -----> · Temperature sensor defective
Coolant temperature sensor checking values:
15 °C to 30 °C/59 °F to 86 °F: 1.3 to 3.6 kW
80 °C/176 °F: 250 to 360 W
Notes on Trouble Codes 14 and 15:
Model Year '88 Vehicles:
When trouble code 14 is stored, the control unit takes a replacement value of -33 °C/-26 °F.
This leads to enrichment of the system and the engine may cut out after a short period of time.
Trouble code 15 is not activated in the control unit here, which means that faults that occur are not recognized by the control unit and are not displayed by the telltale in the instrument panel.