Workshop Manual

7A1–78
TRANSMISSION CONTROL SYSTEM (4L30–E)
DTC P1850 Brake Band Apply Solenoid Malfunction (Cont’d)
Step NoYesAction
12 1. Disconnect the transmission main case connector E-42.
2. Using the J39200 DVOM, check continuity between the
terminals E42–7(B) and ground.
Is there a continuity?
Go to Step 13 Go to Step 17
13 The brake band apply solenoid is faulty, or the internal wiring
harness from the brake band apply solenoid is shorted to ground.
Was a problem found and corrected?
Go to Step 20 —
14 The wiring harness between the PCM connector terminal E35–43
and the transmission main case connector terminal E42–2(D) is
shorted to ground.
Was a problem found and corrected?
Go to Step 20 —
15 The wiring harness between the PCM connector terminal E35–43
and the transmission main case connector terminal E42–2(D) is
open.
Was a problem found and corrected?
Go to Step 20 —
16 The brake band apply solenoid is faulty, or the internal wiring
harness from the brake band apply solenoid is open.
Was a problem found and corrected?
Go to Step 20 —
17 The wiring harness between the PCM connector terminal E35–10
and the transmission main case connector terminal E42–7(B) is
shorted to ground.
Was a problem found and corrected?
Go to Step 20 —
18 The wiring harness between the PCM connector terminal E35–10
and the transmission main case connector terminal E42–7(B) is
open.
Was a problem found and corrected?
Go to Step 20 —
19 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 20 —
20 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 brake band apply solenoid is commanded “on” and the
volts drop to zero.
B 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?
Begin diagnosis
again
Go to
Step 1
Repair verified
Exit DTC table