СИСТЕМА ECD - Pre-heating Control Circuit
DESCRIPTION
When the ignition switch is turned to ON, the ECM calculates the glow indicator lighting time/heating corresponding to the coolant temperature at that time and turns on the glow indicator light/glow plug relay (GLOW).
As ceramic is used for glow plug assembly material, current control is not performed.
WIRING DIAGRAM
INSPECTION PROCEDURE
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.CHECK GLOW INDICATOR LIGHT |
Turn the ignition switch to ON.
Check that the glow indicator light comes on.
- OK:
- The glow indicator light remains on for 0.5 seconds or more, and then goes off.
| 2.CHECK GLOW PLUG ASSEMBLY (INSTALLATION) |
Check that the glow plug assembly and glow plug wire are securely installed.
- OK:
- The glow plug assembly and glow plug wire are securely installed.
| | TIGHTEN GLOW PLUG ASSEMBLY |
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| 3.INSPECT GLOW PLUG ASSEMBLY (RESISTANCE) |
Inspect the glow plug assembly (See page ).
| | REPLACE GLOW PLUG ASSEMBLY
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| 4.CHECK INDICATOR LIGHTING TIME AND AFTER GLOW TIME |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON and turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.
Read the DTCs (See page ).
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output | B |
| 6.INSPECT GLOW RELAY ASSEMBLY |
Inspect the glow plug relay (GLOW) (See page ).
| | REPLACE GLOW PLUG RELAY (GLOW) |
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| 7.CHECK ECM (SREL VOLTAGE) |
Turn the ignition switch to the start position.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| G61-2 (SREL) - C101-14 (E1) | Cranking | 11 to 14 V |
Text in Illustration| *a | Component with harness connected
(ECM) |
| 8.CHECK HARNESS AND CONNECTOR (GLOW RELAY - ECM AND BODY GROUND) |
Disconnect the ECM connector.
Remove the glow relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| G61-2 (SREL) - Relay block glow relay terminal 2 | Always | Below 1 Ω |
| Relay block glow relay terminal 1 - Body ground | Always | Below 1 Ω |
- Standard Resistance (Check for Short):
| Tester Connection | Condition | Specified Condition |
| G61-2 (SREL) or relay block glow relay terminal 2 - Body ground | Always | 10 kΩ or higher |
Reconnect the ECM connector.
Reinstall the glow relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 9.CHECK HARNESS AND CONNECTOR (GLOW PLUG RELAY (GLOW) - GLOW PLUG ASSEMBLY AND BATTERY) |
Disconnect the cable from the negative (-) battery terminal.
Disconnect the cable from the positive (+) battery terminal.
Remove the glow relay from the engine room relay block.
Disconnect the glow plug wire.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance (Check for Open):
| Tester Connection | Condition | Specified Condition |
| Relay block glow relay terminal 3 - C114-1 | Always | Below 1 Ω |
| Relay block glow relay terminal 5 - Positive (+) battery terminal | Always | Below 1 Ω |
- After reconnecting the battery cable, the radio and clock need to be adjusted as they were previously.
Reinstall the glow relay.
Reconnect the glow plug wire.
Reconnect the cable to the positive (+) battery terminal.
Reconnect the cable to the negative (-) battery terminal.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
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| 10.CHECK ECM (GIND VOLTAGE) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| G62-1 (GIND) - C101-14 (E1) | Ignition switch ON | 11 to 14 V |
Text in Illustration| *a | Rear view of wire harness connector
(to ECM) |
Reconnect the ECM connector.
| 11.CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER ASSEMBLY) |
Disconnect the combination meter assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| G7-8 - G62-1 (GIND) | Always | Below 1 Ω |
Reconnect the combination meter assembly connector.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 12.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY) |
Disconnect the combination meter assembly connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| G6-28 - Body ground | Ignition switch ON | 11 to 14 V |
Text in Illustration| *a | Front view of wire harness connector
(to Combination Meter Assembly) |
Reconnect the combination meter assembly connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE COMBINATION METER ASSEMBLY
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