DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK CRANKING
READ VALUE USING GTS (STARTER SIGNAL)
INSPECT STARTER RELAY (ST)
CHECK HARNESS AND CONNECTOR (PNP SWITCH - ST RELAY)
CHECK HARNESS AND CONNECTOR (POWER SOURCE)
INSPECT STARTER
INSPECT STARTER CUT RELAY (ST CUT)
CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)
INSPECT PARK/NEUTRAL POSITION SWITCH
CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM)
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM)
CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM)
REPLACE ECM
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
ECD SYSTEM (w/ DPF) - Cranking Holding Function Circuit
DESCRIPTION
The cranking holding control system provides current to the starter when the ECM detects the engine switch start signal (STSW). When the ECM performs a firing judgment, the system cuts current to the starter. When an ECM receives the STSW signal, it turns on the ST CUT relay, which prevents flickering of the combination meter, clock, audio system, etc. Also, the ECM sends a signal to the ECM STAR terminal of the ECM. Then the STAR output signal travels through the park/neutral position (PNP) switch to the ST relay, causing the starter to activate.
When the engine is cranking, the starter operation signal is sent to the ECM STA terminal of the ECM.
WIRING DIAGRAM
Refer to DTC P0617 ().
INSPECTION PROCEDURE
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration () and initialization ().
Check the cranking of the engine.
- Result:
| Test Result | Proceed to |
| Cranking possible and holding control operates | A |
| Does not crank | B |
| Cranking possible but holding control does not operate | C |
| A | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 2.READ VALUE USING GTS (STARTER SIGNAL) |
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Enter the following menus: Powertrain / Engine and ECT / Data List / Starter Signal.
Check the result when the engine switch is turned on (IG) and when the engine is started.
- OK:
| Engine Switch Condition | Display (Starter Signal) |
| On (IG) | Close |
| Engine started | Open |
| 3.INSPECT STARTER RELAY (ST) |
Inspect the starter relay (ST) ().
| | REPLACE STARTER RELAY (ST) |
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| 4.CHECK HARNESS AND CONNECTOR (PNP SWITCH - ST RELAY) |
Disconnect the Park/Neutral Position (PNP) switch.
Remove the ST relay from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| ST relay (2) - C24-5 (L) | Always | Below 1 Ω |
| ST relay (2) or C24-5 (L) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.CHECK HARNESS AND CONNECTOR (POWER SOURCE) |
Remove the ST relay from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| ST relay (1) - ST relay (5) | Always | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER RELAY (ST) - BATTERY, BODY GROUND) |
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Inspect the starter ().
- Result:
| Test Result | Proceed to |
| OK | A |
| NG | B |
| A | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR (STARTER - STARTER RELAY (ST), BATTERY) |
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| 7.INSPECT STARTER CUT RELAY (ST CUT) |
Inspect the starter cut relay (ST CUT) ().
| | REPLACE STARTER CUT RELAY (ST CUT) |
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| 8.CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM) |
Remove the starter cut relay (ST CUT) from the engine room relay block.
Disconnect the PNP switch connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| ST CUT relay (5) - C45-52 (STAR) | Always | Below 1 Ω |
| ST CUT relay (3) - C24-4 (B) | Always | Below 1 Ω |
| ST CUT relay (5) or C45-52 (STAR) - Body ground | Always | 10 kΩ or higher |
| ST CUT relay (3) or C24-4 (B) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| ST CUT relay (5) - C46-52 (STAR) | Always | Below 1 Ω |
| ST CUT relay (3) - C24-4 (B) | Always | Below 1 Ω |
| ST CUT relay (5) or C46-52 (STAR) - Body ground | Always | 10 kΩ or higher |
| ST CUT relay (3) or C24-4 (B) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 9.INSPECT PARK/NEUTRAL POSITION SWITCH |
Inspect the Park/Neutral Position (PNP) switch.
Disconnect the PNP switch connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 4 (B) - 5 (L) | Shift lever in P | Below 1 Ω |
| Shift lever in N | Below 1 Ω |
| | REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY ()
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| 10.CHECK HARNESS AND CONNECTOR (PNP SWITCH - ECM) |
Disconnect the PNP switch connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| C24-5 (L) - A38-46 (STA) | Always | Below 1 Ω |
| C24-5 (L) or A38-46 (STA) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| C24-5 (L) - A52-46 (STA) | Always | Below 1 Ω |
| C24-5 (L) or A52-46 (STA) - Body ground | Always | 10 kΩ or higher |
Result| Result | Proceed to |
| NG | A |
| OK | B |
| A | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 11.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - ECM) |
Disconnect the main body ECU connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| E4-4 (STSW) - A38-47 (STSW) | Always | Below 1 Ω |
| E4-4 (STSW) or A38-47 (STSW) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| E4-4 (STSW) - A52-47 (STSW) | Always | Below 1 Ω |
| E4-4 (STSW) or A52-47 (STSW) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 12.CHECK HARNESS AND CONNECTOR (ST CUT RELAY - PNP SWITCH, ECM) |
Remove the starter cut relay (ST CUT) from the engine room relay block.
Disconnect the PNP switch connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for LHD| Tester Connection | Condition | Specified Condition |
| ST CUT relay (5) - C45-52 (STAR) | Always | Below 1 Ω |
| ST CUT relay (3) - C24-4 (B) | Always | Below 1 Ω |
| ST CUT relay (5) or C45-52 (STAR) - Body ground | Always | 10 kΩ or higher |
| ST CUT relay (3) or C24-4 (B) - Body ground | Always | 10 kΩ or higher |
for RHD| Tester Connection | Condition | Specified Condition |
| ST CUT relay (5) - C46-52 (STAR) | Always | Below 1 Ω |
| ST CUT relay (3) - C24-4 (B) | Always | Below 1 Ω |
| ST CUT relay (5) or C46-52 (STAR) - Body ground | Always | 10 kΩ or higher |
| ST CUT relay (3) or C24-4 (B) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 14.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
Check the starter operation.
- OK:
- Malfunction has been repaired successfully.
| | GO TO ENTRY AND START SYSTEM (ENGINE DOES NOT START) ()
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