Isuzu Trooper 1999 Workshop Manual page 1534

DTC P1850 Brake Band Apply Solenoid Malfunction (Cont'd)
Step
22 The wiring harness between the PCM connector terminal J1–A16
and transmission 16–way connector terminal H53–13 is shorted
to ground.
Was a problem found and corrected?
23 The wiring harness between the transmission 16–way connector
terminal H53–13 and the transmission main case connector
terminal M7–2(B) is shorted to ground.
Was a problem found and corrected?
24 The wiring harness between the PCM connector terminal J1–A16
and the 16–way connector terminal H53–13 is open.
Was a problem found and corrected?
25 The wiring harness between the transmission 16–way connector
terminal H53–13 and the transmission main case connector
terminal M7–2(B) is open.
Was a problem found and corrected?
26 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?
27 1. After the repair is complete, use the scan tool to select "DTC",
then "Clear Info" function and ensure the following conditions
are met:
f The brake band apply solenoid is commanded "on" and the
volts drop to zero.
f The brake band apply solenoid is commanded "off" and the
volts increase to B+.
2. Review the scan tool "DTC Info".
Has the last test failed or is the current DTC displayed?
TRANSMISSION CONTROL SYSTEM (4L30–E)
Action Yes
Go to Step 27
Go to Step 27
Go to Step 27
Go to Step 27
Go to Step 27
Begin diagnosis
again
Repair verified
Go to Step 1 Exit DTC table
7A1–81
No
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