Code
P1761
DAEWOO
P — Powertrain
Ecu keep alive mem. mal
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UK: 3
EN: 3
RU: 16
AI status
Completed
Completed
100%
Causes
- Corrupted or failed EEPROM/nonvolatile memory inside ECU
- Loss of permanent battery power (B+) to ECU KAM circuit
- Intermittent or high resistance ground to ECU
- Damaged/poor ECU connector or wiring (pin corrosion, broken wire)
- Faulty ECU software or interrupted programming/flash
- Water intrusion or physical damage to ECU
Symptoms
- MIL (check engine light) illuminated
- Stored adaptations or learned values lost (idle, shift points, trim)
- Driveability issues after battery disconnect or repeated MIL
- Some systems may revert to default/failsafe behavior
- Possible recurring storage of the same code after clearing
What to check
- Read freeze frame and related codes with a scan tool; note history and if code is permanent
- Check battery voltage (with ignition off and on) and battery condition
- Inspect fuses and fusible links for permanent B+ to ECU (KAM) circuit
- Visually inspect ECU connectors for corrosion, bent pins, or water damage
- Measure continuity/resistance of ECU ground(s); check for
- Check wiring for intermittent opens/shorts between battery, ground and ECU KAM pin
Signal parameters
- Permanent battery voltage at ECU KAM supply pin: ~11.5–14.5 V (ignition off and on)
- Ignition-switched 12V (if separate): ~11.5–14.5 V when ON
- Ground continuity to battery negative: resistance ideally
- KAM supply current draw (parasitic) typically low; large currents indicate short
- CAN/LIN bus activity: normal waveform and voltages when ignition on (if KAM fault affects bus behavior)
Diagnostic algorithm
- Using a scan tool, confirm P1761 and record freeze frame and related codes. Note if code is current or history.
- Inspect battery condition and terminals; verify battery voltage fully charged (12.4 V+ at rest).
- Locate and inspect fuses/fusible links for permanent B+ to ECU; replace any blown fuses and recheck code.
- With connector disconnected, inspect ECU connector pins for corrosion, bent pins, or damage.
- Measure voltage at the ECU KAM (permanent B+) pin with ignition off and on. Expected ~12 V. If missing, trace wiring to battery/fuse.
- Measure resistance between ECU ground pins and chassis/battery negative; repair high resistance ground connections.
- Check for intermittent wiring faults: wiggle harness while monitoring KAM voltage and watch for code set or voltage drops.
- If power/ground/wiring OK, attempt to clear code and power‑cycle; if code returns immediately or cannot be cleared, suspect internal ECU memory fault.
- If supported, perform ECU self‑test or memory checksum via manufacturer scan tool; attempt software reflash or reprogram according to service procedure.
- If reflash/programming fails or ECU reports internal memory failure, replace or repair the ECU (ensure correct reprogramming and immobilizer pairing if required).
- After repair, clear codes and verify normal operation over multiple ignition cycles and a short road test.
Likely causes
- Open or blown fuse for permanent battery feed to ECU
- Corroded battery terminal or poor battery connection causing voltage dips
- Bad/loose ECU ground strap or connector pin with high resistance
- Internal ECU memory (EEPROM) failure requiring reprogram or replacement
- Aftermarket electrical work or battery disconnect that corrupted stored data
Fault status
Status
ECU keep‑alive memory malfunction (EEPROM/nonvolatile memory corrupted or inaccessible). Persistent memory failure reported by ECU. DTC P1761 stored.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
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