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P0705



JATCO Fault P0705 - Inhibitor Switch

P0705 - Inhibitor switch input multiple signal or no signal.

Possible causes:
1. Passenger fuse box Fuse 35.
2. Open Circuit C580/3(W) to C244/10(W).
3. Open Circuit C244/6(W) to C059/3(W).
4. Short Circuit C244/6(W) to Ground.
5. Open Circuit C244/5(GY) to C932/8(GY).
6. Open Circuit C244/3(OB) to C932/7(OB).
7. Open Circuit C244/4(RG) to C932/45(RG).
8. Open Circuit C244/1(WB) to C932/27(WB).
9. Open Circuit C244/2(WU) to C932/25(WU).
10. Open Circuit C244/7(NG) to C932/26(NG).
11. Open Circuit C244/9(KO) to C932/30(KO).
12. Short Circuits C244 pins 1,2,3,4,5,7 and 9.
13. Open Circuit C244/8(NK) to 12 V.
14. Connectors C059,C244,C245,C580.
15. Bowden cable out of adjustment.
16. Gear selector switch mechanism.
17. Immobiliser EWS3 ECU.
18. JATCO ATCU ECU.

1. Passenger fuse box Fuse 35.
POWER_DISTRIBUTION
- Check for fuse not correctly inserted, fuse blown, fuse connections loose, damaged or corroded.
- Certain diagnostics may also perform further checks to try and narrow down the fault. Eg: Check if other circuits fed by the same fuse are also experiencing problems

2. Open Circuit C580/3(W) to C244/10(W).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

3. Open Circuit C244/6(W) to C059/3(W).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

4. Short Circuit C244/6(W) to Ground.
SHORT_CIRCUIT
Check resistance < 5.0 Ohms.

5. Open Circuit C244/5(GY) to C932/8(GY).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

6. Open Circuit C244/3(OB) to C932/7(OB).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

7. Open Circuit C244/4(RG) to C932/45(RG).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

8. Open Circuit C244/1(WB) to C932/27(WB).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

9. Open Circuit C244/2(WU) to C932/25(WU).
OPEN_CIRCUIT
Check resistance > 1M Ohms

10. Open Circuit C244/7(NG) to C932/26(NG).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

11. Open Circuit C244/9(KO) to C932/30(KO).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

12. Short Circuits C244 pins 1,2,3,4,5,7,and 9.
SHORT_CIRCUIT
Check resistance < 5.0 Ohms.

13. Open Circuit C244/8(NK) to 12 V.
OPEN_CIRCUIT
Check resistance > 1M Ohms.

14. Connectors C059,C244,C245,C580.
CONNECTOR
Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

15. Bowden cable out of adjustment.
- This fault is generated if there is a fault with the inhibitor switch or the gear selector switches.
- The engine can only be started if the Immobilisation ECU (EWS3) has a 12 V supply from the Inhibitor switch.
- This supply is derived from passenger fusebox fuse 35.
- The Inhibitor switch is linked to the gear lever, via a Bowden cable, and is integral with the Gear Selector switches.
- The inhibiter switch is an integral part of the gear selector switch mechanism and should close when either Neutral or Park is selected. This then supplies 12 V to the Immobilisation ECU, (EWS3) which allows the engine to be started.
- This fault is also generated if the selector switch shows no selection, or more than one selection.
- The gear selection indicator lamps, by the gear lever, are driven directly by the selector switch.
- The switch is located on top of the transmission and is operated by the gear lever via a steel Bowden cable.
- Ensure that this cable is adjusted correctly.

16. Gear selector switch mechanism.
- This fault is generated if there is a fault with the inhibitor switch or the gear selector switches.
- The engine can only be started if the Immobilisation ECU (EWS3) has a 12 V supply from the Inhibitor switch.
- This supply is derived from passenger fusebox fuse 35.
- The Inhibitor switch is linked to the gear lever, via a Bowden cable, and is integral with the Gear Selector switches.
- The inhibiter switch is an integral part of the gear selector switch mechanism and should close when either Neutral or Park is selected. This then supplies 12 V to the Immobilisation ECU, (EWS3) which allows the engine to be started.
- This fault is also generated if the selector switch shows no selection, or more than one selection.
- The gear selection indicator lamps, by the gear lever, are driven directly by the selector switch.
- The switch is located on top of the transmission and is operated by the gear lever via a steel Bowden cable.
- Ensure that this cable is adjusted correctly.

17. Immobiliser EWS3 ECU.
- This fault is generated if there is a fault with the inhibitor switch or the gear selector switches.
- The engine can only be started if the Immobilisation ECU (EWS3) has a 12 V supply from the Inhibitor switch. This supply is derived from passenger fusebox fuse 35.
- The Inhibitor switch is linked to the gear lever, via a Bowden cable, and is integral with the Gear Selector switches.
- Ensure that C059/3 switches between 12 V and ground when the gear selector is moved from Neutral or Park to Drive and that the connector is sound.
- If TestBook available, use the Basic Toolbox and diagnositics for the EWS3 ECU to investigate this fault in more detail.

18. JATCO ATCU ECU.
- This fault is generated if there is a fault with the inhibitor switch or the gear selector switches.
- The engine can only be started if the Immobilisation ECU (EWS3) has a 12 V supply from the Inhibitor switch. This supply is derived from passenger fusebox fuse 35.
- The Inhibitor switch is linked to the gear lever, via a Bowden cable, and is integral with the Gear Selector switches.
- Test the operation of the gear selector mechanism using Real Time Display and also check the gear position shown by the lamps by the gear lever.
- Fully investigate all other possibilities before replacing the JATCO ECU.
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