TC - Testing Notes

NOTE: You should enter this Pinpoint Test only when you have been directed here from Quick Test.


REMEMBER

This Pinpoint Test is not intended to diagnose components interior to the transmission. To prevent the replacement of good components, be aware that the following non-EEC areas may be at fault.


- Engine

Performance, vacuum, cooling

- Brakes

Not releasing

- Electrical

Alternator, battery, integrity

- Transmission

Hydraulic fluid, friction elements, cooling


This Pinpoint Test is intended to diagnose only the following:


- Harness circuits: M/CCC, CCO, CCS, EPC, SS3/4-4/3 SS1, SS2, SS3, SIG RTN, EPC PWR, and VPWR

- Processor assembly



DESCRIPTION


The A4LD, AXOD-E, AOD-E, and E40D transmissions use solenoids to shift transmission gear ratios, connect both turbine and impeller in the torque converter, and provides coasting on deceleration. The ground signal is controlled by the EEC-IV processor and 12 volts VPWR is supplied to the solenoids from the EEC-IV power relay.