Toyota Corolla Cross: Park/Neutral Switch Circuit Short to Battery (P085012,P085014)
DESCRIPTION
The engine stop and start ECU detects malfunctions by comparing the conditions of the shift position signal and NSW signal.
If a malfunction is detected, the engine stop and start ECU stores DTC P085012 or P085014.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Warning Indicate |
Note |
|---|---|---|---|---|---|---|
| P085012 |
Park/Neutral Switch Circuit Short to Battery |
Both of the following conditions are met for 15 seconds or more (2 trip detection logic):
|
| Does not come on |
Does not come on | SAE Code: P0852 |
|
P085014 | Park/Neutral Switch Circuit Short to Ground or Open |
Both of the following conditions are met for 2 seconds or more (2 trip detection logic):
|
| Does not come on |
Does not come on | SAE Code: P0851 |
WIRING DIAGRAM
w/ Smart Key System
w/o Smart Key System
CAUTION / NOTICE / HINT
NOTICE:
- Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.
Click here
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- After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).
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- After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.
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- When the ECM is replaced on a vehicle with a non-specified auxiliary battery, it is necessary to perform auxiliary battery type switching.
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- When the engine stop and start ECU or oil pump with motor assembly is replaced, check the oil pump with motor assembly.
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- Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
- Using the GTS, read the freeze frame data before troubleshooting. System condition information is recorded as freeze frame data the moment a DTC is stored. This information can be useful when troubleshooting.
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- For wire harness and connector inspection procedures and precautions, refer to
- DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.
PROCEDURE
|
1. | READ VALUE USING GTS (SHIFT SW STATUS) |
(a) Enter the following menus: Powertrain / Transmission / Data List / Shift SW Status (P, R, N, D Range).
Powertrain > Transmission > Data List|
Tester Display |
|---|
| Shift SW Status (P Range) |
|
Shift SW Status (R Range) |
|
Shift SW Status (N Range) |
|
Shift SW Status (D Range) |
(b) In accordance with the display on the GTS, read the Data List.
Powertrain > Transmission > Data List|
Tester Display | Measurement Item |
Range | Normal Condition |
|---|---|---|---|
|
Shift SW Status (P Range) |
Park/Neutral position switch assembly status |
OFF or ON | OFF: Shift lever not in P ON: Shift lever in P |
|
Shift SW Status (R Range) |
Park/Neutral position switch assembly status |
OFF or ON | OFF: Shift lever not in R ON: Shift lever in R |
|
Shift SW Status (N Range) |
Park/Neutral position switch assembly status |
OFF or ON | OFF: Shift lever not in N ON: Shift lever in N |
|
Shift SW Status (D Range) |
Park/Neutral position switch assembly status |
OFF or ON | OFF: Shift lever not in D or S ON: Shift lever in D or S |
| NG | .gif) | GO TO STEP 5 |
|
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| 2. |
READ VALUE USING GTS (NEUTRAL POSITION SW) |
(a) Enter the following menus.
Powertrain > Transmission > Data List|
Tester Display |
|---|
| Neutral Position SW |
(b) In accordance with the display on the GTS, read the Data List.
Powertrain > Transmission > Data List|
Tester Display | Measurement Item |
Range | Normal Condition |
|---|---|---|---|
|
Neutral Position SW | Park/Neutral position switch assembly status |
OFF or ON | OFF: Shift lever not in P or N ON: Shift lever in P or N |
| OK | | USE SIMULATION METHOD TO CHECK |
|
| 3. |
INSPECT PARK/NEUTRAL POSITION SWITCH |
- for 2WD: Click here
- for AWD: Click here
| NG | | REPLACE PARK/NEUTRAL POSITION SWITCH for 2WD: Click here for AWD: Click here
|
|
| 4. |
CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the A169 engine stop and start ECU connector.
(b) Disconnect the C62 park/neutral position switch assembly connector.
(c) Disconnect the A47 ECM connector.
(d) Disconnect the I223 certification ECU (smart key ECU Assembly) connector.*1
- *1: w/ Smart Key System
(e) Remove the ST relay from the No. 1 engine room relay block.
(f) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
A169-21 (STA) - C62-5 (L) |
Always | Below 1 Ω |
|
A169-17 (CLL) - C62-4 (B) |
Always | Below 1 Ω |
|
A169-21 (STA) - Body ground and other terminals |
Always | 10 kΩ or higher |
|
C62-5 (L) - Body ground and other terminals |
Always | 10 kΩ or higher |
|
A169-17 (CLL) - Body ground and other terminals |
Always | 10 kΩ or higher |
|
C62-4 (B) - Body ground and other terminals |
Always | 10 kΩ or higher |
| OK | | REPLACE ENGINE STOP AND START ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. |
INSPECT PARK/NEUTRAL POSITION SWITCH |
for 2WD: Click here
for AWD: Click here
| NG | |
REPLACE PARK/NEUTRAL POSITION SWITCH for 2WD: Click here for AWD: Click here
|
|
| 6. |
CHECK HARNESS AND CONNECTOR (ECM AND TCM - PARK/NEUTRAL POSITION SWITCH ASSEMBLY) |
(a) Disconnect the C80 TCM connector.
(b) Disconnect the A47 ECM connector.
(c) Disconnect the C62 park/neutral position switch assembly connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
C80-29 (P) - C62-6 (PL) |
Always | Below 1 Ω |
|
C80 30 (R) - C62-1 (RL) |
Always | Below 1 Ω |
|
C80-32 (N) - C62-9 (NL) |
Always | Below 1 Ω |
|
C80-31 (D) - C62-7 (DL) |
Always | Below 1 Ω |
|
A47-23 (NSW) - C62-4 (B) |
Always | Below 1 Ω |
| OK | | REPLACE TCM for 2WD: Click here for AWD: Click here
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
