P0706

DTC P0706 Transmission Range Switch (Mode Switch) Performance
Circuit Description
The range switch supplies the Powertrain Control Module (PCM) with information regarding the selector lever position: P. R. N. D, 3, 2 or L. The selector lever position is indicated by the state of four ON/OFF contracts. The range switch is located on one side of the transmission. It is on the transmission manual shaft and is fixed to the main case.
The range switch is also used to provide the information P or N to the engine crank wiring. The engine can be cranked only if connector M-25 terminal 4(H) is connected to terminal 1 (E) which is connected to ground.
The range switch is also used to provide the backup lamp power in reverse. This is why the mode switch is supplied through a 15A fuse (CB-15). This fuse can burn due to a shot circuit in the backup lamp.
This DTC detects an invalid state of the range switch or the range switch circuit by deciphering the range switch inputs. This is a type "D" DTC.

Conditions For Setting The DTC
This DTC will set if any of the following conditions occurs:

Condition 1 ("R" bad position):
- Engine is running.
- No output speed DTCP0722, P0723.
- Output speed greater then 3,200 RPM.
- Range switch indicates "R".
- All conditions met for 4 seconds.

Condition 2 ("P" or "N" bad position):
- Engine is running.
- No TPS codes.
- Engine speed is less than 3,000 RPM.
- TP angle is greater than 20%.
- Range switch indicates "P" or "N".
- All conditions met for 4 seconds.

Action Taken When The DTC Sets
- Default to "D" position.
- The PCM will not illuminate the Malfunction Indicator Lamp (MIL) and CHECK TRANS Lamp.

Conditions For Clearing The DTC
- The DTC can be cleared from the PCM history by using a scan tool.
- The DTC will be cleared from history when the vehicle has achieved 40 warmup cycles without a failure reported.
- The PCM will cancel the DTC default actions when the fault no longer exists and the ignition is cycled "off" long enough to power down the PCM.

Diagnostic Aids
- Refer to the accompanying chart for the normal range signals and the illegal combinations.
- Inspect the wiring for poor electrical connections at the PCM and at the transmission 8-way connector. Look for possible bent, backed out, deformed or damaged terminals. Check for weak terminal tension as well. Also check for a chafed wire that could short to bare metal or other wiring. Inspect for a broken wire inside the insulation.
- When diagnosing for a possible intermittent short or open condition, move the wiring harness while observing test equipment for a change.
- Refer to Range Switch Logic Table or "Functional Test Procedure" for further information.

Test Description
The numbers below refer to the step numbers on the diagnostic chart:
3. This test checks the indicated range signal to the manual valve actually selected.
6. This test checks for continuity between each selected range switch connector terminals.





Range Switch Logic Table