Workshop Manual

7A1–80
TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P1860 TCC PWM Solenoid Electrical
Step Action Yes No
1 Were you sent here from the “Powertrain On–Board Diagnostic
(OBD) System Check”?
Go to Step 2
Go to OBD
System Check
Refer to
Driveability and
Emission in
Engine section
2 1. Install the scan tool.
2. With the engine “on”, 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”.
Was DTC P1860 set?
Go to Step 3 Go to Step 4
3 Using the J39200 DVOM, back probe between PCM connector
terminals E35–51 and E35–33.
Is the voltage 0?
Go to Step 5 Go to Step 6
4 1. Apply brake pedal and select transmission range “D”.
2. Do a test drive, and increase the vehicle speed to TCC “on” at
4th.
Does the scan tool display DTC P1860 at TCC “ON”?
Go to Step 9
Go to Diagnostic
Aids
5 1. Turn the ignition “off”.
2. Disconnect the E-35 (RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
PCM connector terminals E35–51 and E35–33.
Is the resistance within 18 – 20 ohms?
Go to Step 7 Go to Step 8
6 The wiring harness between PCM connector terminal E35–51
and transmission adapter case connector terminal E40–1(A) is
shorted to voltage.
Was a problem found and corrected?
Go to Step 15 Go to Step 16
7 Intermittent condition.
Check the wiring harness and terminals between PCM connector
J2 and transmission adapter case connector E–40.
Was a problem found and corrected?
Go to Step 15 Go to Step 16
8 1. Disconnect the transmission adapter case connector E–40.
2. Using the J39200 DVOM, measure the resistance between
terminal E40–1(A) and ground.
Is the resistance within 18 – 20 ohms?
Go to Step 13 Go to Step 14
9 1. Turn the ignition “off”.
2. Disconnect the E-35 (RED) PCM connector.
3. Using the J39200 DVOM, measure the resistance between
terminals E35–51 and E35–33.
Is the resistance within 18 – 20 ohms?
Go to Step 15 Go to Step 10
10 1. Disconnect the transmission adapter case connector E–40.
2. Using the J39200 DVOM, measure the resistance between
terminal E40–1(A) and ground.
Is the resistance within 18–20 ohms?
Go to Step 11 Go to Step 12
11 The wiring harness between PCM connector E-35 and adapter
case connector E-40 is shorted to ground.
Was a problem found and corrected?
Go to Step 17 —