What this code means
P0706 can indicate a missing transmission range switch signal to the TCM.
P0706 concerns the transmission range switch signals received by the TCM. The procedure describes a missing forward signal during the specified repeated driving condition. It then uses the pattern of switch signals to choose the applicable inspections.
The range-switch information is a group of signals, not a single reading. Individual position signals and the forward/reverse signals have different expected ON/OFF patterns. Looking at them as a group explains why the procedure distinguishes some signals being OFF from all of the signals being OFF.
What the vehicle may do
- The TCM may be missing the ATPFWD signal.
Possible fault areas
- The transmission range switch or its circuits may have a problem.
- The TCM may also be a fault area.
The shift-position comparison comes before the response and wire inspections. It establishes which signal failed to indicate ON and which starting condition applies. The response check then uses the terminal for that particular signal with the switch connector disconnected.
The later open-wire checks examine the individual ATP and PG1 paths using their own terminal pairs. Their resistance results are different from the earlier HDS ON/OFF observations. Retain those separate result types when following the switch, circuit or TCM branch.
Diagnostic path
Understand the stored condition
P0706 means Transmission Range Switch Circuit Open. This can involve a missing transmission range switch signal. The TCM stores this code if it cannot detect the ATPFWD signal during repeated driving with specified accelerations and decelerations in D or S position/mode.
Choose the applicable checks
Check the signals in each shift position/mode. The failure conditions and vehicle conditions may help narrow which checks are needed. Some transmission range switching signals OFF is condition [A]. All transmission range switching signals OFF is condition [B]. For [A], the indicated checks are Transmission Range Switch Inspection, the open-wire checks, and TCM Inspection. The open-wire checks cover ATP-P, ATP-R, ATP-N, ATP-D, ATP-S, ATP-L, ATP-FWD, ATP-RVS, and PG1. For [B], the indicated work includes Do the Transmission Range Switch Test and those same open-wire checks.
Before using that test's result, obtain and follow the correct procedure for that test.
Compare the shift-position signals
First, make sure the shift cable is properly adjusted. Turn the vehicle to the ON mode. In the HDS, use AT ＞ Data List. Compare the transmission range switch signal inputs in each shift position/mode. A/T P Switch should be ON in P and OFF in R, N, D, S, and L. A/T R Switch should be ON in R and OFF in P, N, D, S, and L.
A/T N Switch should be ON in N and OFF in P, R, D, S, and L. A/T D Switch should be ON in D and OFF in P, R, N, S, and L. A/T S Switch should be ON in S and OFF in P, R, N, D, and L. A/T L Switch should be ON in L and OFF in P, R, N, D, and S. Forward Switch should be OFF in P, R, and N.
It should be ON in D, S, and L. Reverse Switch(ATPRVS) should be ON in R and OFF in P, N, D, S, and L. These are the normal signal inputs.
The individual position switches identify their respective shift positions. The forward and reverse signals cover the particular position groups described in the list. Comparing that full pattern makes it possible to identify a single missing signal or the wider all-signals-OFF condition. Keep the shift-cable adjustment condition with this comparison, because it is an explicit part of the starting setup.
Check the signal response
This check evaluates the component through its related components and wiring. For this check, the transmission range switch connector (10P) must be disconnected. Find the connector terminal for the signal that did not indicate ON during the confirmation check. Connect that terminal to ground with a jumper wire. Turn the vehicle to the ON mode. Use the HDS to check the signal that did not indicate ON. The normal result is that the transmission range switch signal now indicates ON.
If that result is normal, there is a problem with the transmission range switch. If the result is abnormal, there is a problem with other related components.
The terminal chosen for the jumper check comes from the earlier missing-ON finding. That links the test connection to a specific observed signal. A normal response under this setup points to the range switch according to the procedure; an abnormal response keeps other related components in the diagnostic path. This is a signal-response test, separate from the wire resistance measurements that follow.
Prepare for the wiring checks
Before disconnecting the TCM connector, jump the SCS line with the HDS. Wait more than 1 minute before disconnecting that connector. For the open-wire checks, disconnect the TCM connector (50P) and the transmission range switch connector (10P).
The procedure changes from an operating signal check to measurements between disconnected connectors. The HDS SCS action and waiting period belong before the TCM disconnection. After preparation, each named path is identified by its pair of terminals at the TCM and range-switch connectors. The same resistance criterion across several paths does not make their terminal assignments interchangeable.
ATP-P circuit
Use IG Mode OFF for the ATP-P open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 48.
- Other probe: transmission range switch connector (10P) female terminal 5.
- Normal reading: less than 1 ohm.
ATP-R circuit
Use IG Mode OFF for the ATP-R open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 47.
- Other probe: transmission range switch connector (10P) female terminal 4.
- Normal reading: less than 1 ohm.
ATP-N circuit
Use IG Mode OFF for the ATP-N open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 46.
- Other probe: transmission range switch connector (10P) female terminal 9.
- Normal reading: less than 1 ohm.
ATP-D circuit
Use IG Mode OFF for the ATP-D open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 37.
- Other probe: transmission range switch connector (10P) female terminal 3.
- Normal reading: less than 1 ohm.
ATP-S circuit
Use IG Mode OFF for the ATP-S open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 36.
- Other probe: transmission range switch connector (10P) female terminal 8.
- Normal reading: less than 1 ohm.
ATP-L circuit
Use IG Mode OFF for the ATP-L open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 35.
- Other probe: transmission range switch connector (10P) female terminal 2.
- Normal reading: less than 1 ohm.
ATP-FWD circuit
Use IG Mode OFF for the ATP-FWD open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 44.
- Other probe: transmission range switch connector (10P) female terminal 6.
- Normal reading: less than 1 ohm.
ATP-RVS circuit
Use IG Mode OFF for the ATP-RVS open-wire check. To check resistance, place one probe on TCM connector (50P) female terminal 43.
- Other probe: transmission range switch connector (10P) female terminal 10.
- Normal reading: less than 1 ohm.
PG1 circuit
Use IG Mode OFF for the PG1 open-wire check. To check resistance, place one probe on transmission range switch connector (10P) female terminal 1.
- Other probe: ground.
- Normal reading: less than 1 ohm.
What the results mean
If an open-wire check is abnormal, there is a problem in that circuit. For the TCM Inspection, all the other applicable inspection items must indicate normal conditions. If those checks are normal, the TCM is determined to be the cause. That result identifies a problem with the TCM.
Final check
The signal response and wiring results can help identify the applicable fault area.
The final interpretation should retain the observed ON/OFF pattern, the response of the selected missing signal, and the individual wire results. Together they show how the procedure moves from the starting signal condition to the switch, circuit or conditional TCM conclusion. Keep the distinction between the some-signals-OFF and all-signals-OFF paths through that assessment.
