P0706

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-16 terminal 4(H) is connected to terminal 1(E) which is connected to ground.
- The range switch is also used to provide the back up lamp power in reverse. This is the reason why the mode switch is supplied through a 1 5A fuse (CB-1 5). This fuse can burn due to a short circuit in the back up 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 DTCPO722, 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).

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 the "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.
4. This test checks for correct voltage from the PCM to the transmission 8-way connector.





Range Switch Logic Table





DTC P0706 Transmission range Switch (Mode Switch) Performance