Workshop Manual

TRANSMISSION CONTROL SYSTEM (4L30–E)
7A1–81
DTC P1860 TCC PWM Solenoid Electrical (Cont’d)
Step NoYesAction
12 The TCC solenoid is faulty, or the internal wiring harness from the
TCC solenoid is shorted to ground.
Was a problem found and corrected?
Go to Step 17 —
13 The wiring harness between PCM connector terminal E35–51
and adapter case terminal E40–1(A) is open.
Was a problem found and corrected?
Go to Step 17 —
14 The TCC solenoid is faulty, or the internal wiring harness from the
TCC solenoid is open.
Was a problem found and corrected?
Go to Step 17 —
15 Check every connection at the PCM.
If OK, replace the PCM. Refer to
Powertrain Control Module
(PCM) in Automatic Transmission (4L30–E) section.
Is the replacement complete?
Go to Step 17 —
16 Check the PCM connector terminal E35–51, and transmission
adapter case connector terminal E40–1(A).
Was a problem found and corrected?
Go to Step 17 —
17 1. After the repair is complete, use the scan tool to select “DTC”,
then “Clear Info” function and ensure the following conditions
are met:
B The TCC solenoid is commanded “on” and the volts increase
to B+.
B The TCC solenoid is commanded “off” and the volts drop to
zero.
2. Review the scan tool “DTC Info”.
Has the last test failed or is the current DTC displayed?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table