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7A1–34 TRANSMISSION CONTROL SYSTEM (4L30–E)
Diagnostic Aids
f Refer to the accompanying chart for the normal range
signals and the illegal combinations.
f 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.
f When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
f 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.
DTC P0706 Transmission Range Switch (Mode Switch) Performance
Step
1
Were you sent here from the "Powertrain On–Board Diagnostic
(OBD) System Check"?
2
Perform the following checks:
f The transmission linkage from the select lever to the manual
valve is adjusted properly.
f Diagnostic circuit check.
Were the checks performed?
3
1. Install the scan tool.
2. With the engine "off", turn the ignition switch "on".
NOTE: Before clearing DTC(s), use the scan tool to record "Freeze
Frame" and "Failure Records" for reference, as data will be lost
when the "Clear Info" function is used.
3. Record the DTC "Freeze Frame" and "Failure Records".
4. Select each transmission range: D1, D2, D3, D4, N, R, and P.
Does each selected transmission range match the scan tool
"Range Switch" display?
4
Are all range switch pin displays incorrect?
5
Check fuse and wiring to the 8–way connector terminal 5(D) for
opens.
Refer to Mode Switch in Automatic Transmission (4L30–E)
section.
If no problem was found, replace the range switch.
Is the replacement complete?
6. This test checks for continuity between each
Range Switch Logic Table
Action
selected range switch connector terminals.
Range Switch Pin
Range
g
Position
A
Park
ON
OFF
Reverse
ON
ON
Neutral
OFF
ON
D4
OFF
ON
D3
ON
ON
2
ON
OFF
L
OFF
OFF
Illegal
OFF
OFF
Illegal
OFF
OFF
Yes
Go to Step 2
Go to Step 3
Go to Diagnostic
Aids
Go to Step 5
Go to Step 9
B
C
P(G)
OFF
ON
OFF
OFF
OFF
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
No
Go to OBD
System Check
Refer to
Driveability and
Emissions in
Engine section
—
Go to Step 4
Go to Step 6
—
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