DTC 87

DTC 87:

2-3 Shift Solenoid Circuit:

CIRCUIT DESCRIPTION:
The shift solenoids are used inside the valve body to control spool valves. The shift solenoids are used to determine the transmission gear.
Fused ignition power is supplied to 2-3 solenoid. The PCM/TCM will engage 2-3 solenoid by grounding CKT 1223 to energize the 2-3 solenoid.

Code 87 will set when:
^ Vehicle speed is above 7 mph.
^ TPS is more than 25%.
^ PCM/TCM commands 3rd or 4th gear.
^ Transmission ratio indicates transmission is in 1st or 2nd gear.
^ Conditions met for 6 seconds.

TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks the PCM/TCM's ability to ground or control 2-3 shift solenoid.

2. This test checks the power supply and CKT 1223.

3. This test checks the internal transmission harness and 2-3 shift solenoid.

DIAGNOSTIC AIDS:
Check all connections, especially those at the transmission pass-thru connector.