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Position Switch During Cranking









DTC P0705
Position switch during cranking.

Possible causes by suggested order of priority:
- Position switch 12V supply fault.
- General harness problem (position switch).
- connectors C675,EAT C193 .
- L1 open circuit C193/36 (UP) to C675/9 (UP).
- L1 short circuit to +12V C675/9 (UP).
- L2 open circuit C193/8 (UB) to C675/10 (UB).
- L2 short circuit to +12V C675/10 (UB).
- L3 open circuit C193/37 (UG) to C675/7 (UG).
- L3 short circuit to +12V C675/7 (UG).
- L4 open circuit C193/9 (UW) to C675/6 (UW).
- L4 short circuit to +12V C675/6 (UW).
- Faulty position switch(PRND).
- Intermittent fault (position monitoring).
- Short circuit between lines L1,L2,L3 or L4.
- Position switch mechanical alignment fault.

Position switch 12V supply fault.
CHECK THE FOLLOWING:
- CHECK 1: With all connectors in place, as the position switch is moved the reading on the right hand display of TestBook remains as '(0,0,0,0) Invalid F1' (Indicating no 12V supply). If display does not remain as 'Invalid F1' then there is no supply fault present.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
- CHECK 2: With connector C675 disconnected, using a multimeter measure the voltage between C675/8 (NP) and vehicle earth. If this remains below 10 Volts then the fault is present.
POSSIBLE FAULTS
- BCM is not generating the 12V supply for the position switch.
- Open circuit C675/8 (NP) to C663/10 (NP).
DIAGNOSTIC HINTS
- If TestBook available, run BCM diagnostics to check the position switch supply.
- Ensure ignition OFF and use a multimeter to check for open circuit.

General harness problem (position switch).
- If using TestBook, the right hand display shows the state of the four selector lines from the switch to the gearbox ECU (L1,L2,L3,L4) together with the gear state the EAT should read from these settings.
- The left hand display shows the current gear state the controller has actually read.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
CHECK THE FOLLOWING:
- Move the gear position selector switch slowly through all positions. The positions shown on the two displays should always agree and should correspond to the position of the selector switch.
- The right hand display may display 'Intermediate' between gear selections.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
- All of these lines should switch between '0' and '1' during at least one gear selection.
- Any line continuously at '0' may be shorted to ground or open circuit.
- Any line continuously at '1' may be shorted to +12V.
- Any lines which always change to the same value at the same time may be shorted together.
- Otherwise if 'Invalid' gear positions are displayed there may be a problem with the switch.
DIAGNOSTIC HINTS
- Where faulty lines are identified use a multimeter to check the appropriate line for open or short circuit.

Connectors C675,EAT C193.
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

L1 open circuit C193/36 (UP) to C675/9 (UP).
- Check resistance > 1M Ohm

L1 short circuit to +12V C675/9 (UP).
CHECK THE FOLLOWING:
- L1 short circuit to +12V C675/9 (UP)..
- Disconnect C675 before measuring voltage between C675/9 (UP) and vehicle earth.
Between 0.0V and 4.0V.
DIAGNOSTIC HINTS
- If the voltage is above the acceptable range check the harness connected to C675/9 (UP) for short circuit to +12V

L2 open circuit C193/8 (UB) to C675/10 (UB).
- Check resistance > 1M Ohm

L2 short circuit to +12V C675/10 (UB).
CHECK THE FOLLOWING:
- L2 short circuit to +12V C675/10 (UB)..
- Disconnect C675 before measuring voltage between C675/10 (UB) and vehicle earth.
Between 0.0V and 4.0V.
DIAGNOSTIC HINTS
- If the voltage is above the acceptable range check the harness connected to C675/10 (UB) for short circuit to +12V

L3 open circuit C193/37 (UG) to C675/7 (UG).
- Check resistance > 1M Ohm
L3 short circuit to +12V C675/7 (UG).
CHECK THE FOLLOWING:
- L3 short circuit to +12V C675/7 (UG)..
- Disconnect C675 before measuring voltage between C675/7 (UG) and vehicle earth.
Between 0.0V and 4.0V.
DIAGNOSTIC HINTS
- If the voltage is above the acceptable range check the harness connected to C675/7 (UG) for short circuit to +12V

L4 open circuit C193/9 (UW) to C675/6 (UW).
- Check resistance > 1M Ohm

L4 short circuit to +12V C675/6 (UW).
CHECK THE FOLLOWING:
- L4 short circuit to +12V C675/6 (UW).
- Disconnect C675 before measuring voltage between C675/6 (UW) and vehicle earth.
Between 0.0V and 4.0V.
DIAGNOSTIC HINTS
- If the voltage is above the acceptable range check the harness connected to C675/6 (UW) for short circuit to +12V

Faulty position switch(PRND).
- If using TestBook, the right hand display shows the state of the four selector lines from the switch to the gearbox ECU (L1,L2,L3,L4) together with the gear state the EAT should read from these settings.
- The left hand display shows the current gear state the controller has actually read.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
CHECK THE FOLLOWING:
- Move the gear position selector switch slowly through all positions. The positions shown on the two displays should always agree and should correspond to the position of the selector switch.
- The right hand display may display 'Intermediate' between gear selections.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
- All of the selector lines (L1,L2,L3,L4) should switch between '0' and '1' during at least one gear selection.
- Any line continuously at '0' or '1' may indicate a switch problem.
- If 'Invalid' gear positions are displayed but each line has switched between '0' and '1' at least once then there is a problem with the switch.
- If 'Intermediate' values are displayed when the position switch is correctly set to a selection position then the switch is faulty.
POSSIBLE FAULTS
- Faulty gear selector position switch.

Intermittent fault (position monitoring).
CHECK THE FOLLOWING:
- Ensure the fault is not currently present before diagnosing an intermittent fault.
- Check the 'freeze frame' information logged with the fault code.
- If the battery voltage is shown as < 8V then low battery voltage may be causing the problem.
- Check the position switch code. This code indicates the last valid state of the position switch selector before the problem occurred.
- Use the table below to interpret the code:
0 0,0,0,0 (Invalid F1)
1 1,0,0,0 (P)
2 0,1,0,0 (R)
3 1,1,0,0 (Intermediate Z1)
4 0,0,1,0 (1)
5 1,0,1,0 (Intermediate Z2)
6 0,1,1,0 (Invalid F2)
7 1,1,1,0 (N)
8 0,0,0,1 (2)
9 1,0,0,1 (Invalid F3)
10 0,1,0,1 (Invalid F5)
11 1,1,0,1 (Invalid F4)
12 0,0,1,1 (Intermediate Z4)
13 1,0,1,1 (D)
14 0,1,1,1 (3)
15 1,1,1,1 (Intermediate Z3)
- To determine which line caused the fault look for an invalid code which is the same as the valid code except for a single line changed from a '1' to a '0'.
POSSIBLE FAULTS
- Faulty harness, connector or position switch.

Short circuit between lines L1,L2,L3 or L4.
CHECK THE FOLLOWING:
- CHECK 1: Move the gear position selector switch slowly through all positions. If using TestBook, the positions shown on the right hand display should change each time the gear position is changed. The reading should change from a valid gear through an 'intermediate' value and then back to a valid gear as the switch is moved from one gear position to the next.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
- Carefully observe the individual gear selection lines (L1,L2,L3,L4) as the switch is moved. If two of these lines always change to the same value at the same time it is possible that these two lines are shorted together.
- CHECK 2: Ensure ignition OFF With connector C675 disconnected, using a multimeter measure the resistance between any two suspected select lines.
Select line L1 C193/36 (UP)
Select line L2 C193/8 (UB)
Select line L3 C193/37 (UG)
Select line L4 C193/9 (UW)
- Acceptable range > 500 Ohms.

Position switch mechanical alignment fault.
- If using TestBook, the display shows the state of the four selector lines from the switch to the gearbox ECU (L1,L2,L3,L4) together with the gear state the EAT should read from these settings.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
CHECK THE FOLLOWING:
- Move the gear position selector switch slowly through all positions. If using TestBook, the positions shown on the display should always agree with the mechanical position of the selector switch.
- The display may display 'Intermediate' between gear selections but should NOT display 'Intermediate' when the selector is in position to select a gear.
- (If TestBook not available, use Live Data reading function on Scan Tool. [See Scan Tool manufacturers handbook for detailed instruction])
DIAGNOSTIC HINTS
- If Intermediate or the incorrect gear is displayed refer to the workshop manual and adjust the gear selector.
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