This fault code 89 troubleshooting manual gives the Eaton procedure for Fault Code 89 (or 19) on the Fuller Advantage transmission, isolating a High Integrity Link (HIL) communication fault between the ECA and the TECU. It is part of Eaton publication TRTS0980, Fault Isolation Procedures, and begins with the Electrical Pretest before working through the harness and terminating-resistor checks to Step V.
Fault code 89 troubleshooting document details
| Brand | Eaton |
|---|---|
| Model coverage | Fuller Advantage Heavy Duty automated transmission |
| System / Group | DTCs — High Integrity Link (HIL) |
| Publication no. | TRTS0980 |
| Year / Revision | 2016.06.20 |
| Pages | 7 |
| File size | 0.7 MB |
| Format | |
| Language | English |
Document table of contents
- Perform the Electrical Pretest
- Check fault codes and Shift Control Device type
- Product Diagnostic (PD) Mode wiggle test
- Verify 2-Way and 8-Way ECA Connector condition
- Verify ignition voltage to ECA
- Verify HIL positive and negative continuity
- Verify HIL circuit resistance and repair
The procedure checks power and ground supply to the TECU, then verifies the Shift Control Device type, whether an Eaton PBSC, an Eaton Cobra Lever or an OEM shift device. HIL continuity is measured between the 38-Way Transmission Harness Connector Pin 30 and 8-Way ECA Connector Pin 5, and Pin 29 to Pin 4, each 0.0 to 0.6 ohms, with the terminating resistor reading 50 to 70 ohms with an Eaton PBSC or 110 to 130 ohms without.
Applicable truck models
This covers Eaton Fuller Advantage Heavy Duty transmissions using the HIL to link the ECA and TECU. The steps inspect the ECA Power Supply Harness, the 40-amp in-line fusible link, and ignition voltage at 8-Way Pin 7 within 1.2 volts of battery voltage. If Fault Code 89 (or 19) stays active, the sheet directs the technician to contact Eaton for further diagnostics. Confirm coverage with the manufacturer on the Eaton official website.
Who needs this fault code 89 troubleshooting guide
Technicians diagnosing an ECA that has lost High Integrity Link communication use this sequence to confirm harness continuity and resistor values before replacing the transmission harness or ECA.
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