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 |
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SEE MORE:
Diagnosis System
DIAGNOSIS SYSTEM
CHECK WARNING LIGHT
NOTICE:
When there is a problem with the tire pressure warning system, the tire
pressure warning light blinks at 0.5 second intervals, and illuminates after
1 minute.
When the malfunction has been corrected, the tire pressure warning light
goes
On-vehicle Inspection
ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT
CAUTION: Do not remove the reserve tank cap and air release valve while the engine and radiator assembly are still hot. Pressurized, hot engine coolant and steam may be released and cause serious burns.
PROCEDURE
1. INSPECT RADIATOR CAP SUB-ASSEMB
