Code
P1703
DAEWOO
P — Powertrain
Tps -open/ground
Views:
UK: 2
EN: 7
RU: 4
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the TPS signal/ground circuit
- Short to ground on the TPS signal wire
- Corroded or loose TPS connector pins
- Failed or internally open TPS sensor
- Poor sensor ground or reference (5 V) missing
- Repair or modification damage to the harness
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle or unstable idle
- Hesitation or loss of throttle response
- Surging, stalling, or reduced engine power
- Transmission shift problems on electronically controlled units (if TPS used for shift logic)
- Stored freeze-frame data showing abnormal throttle position readings
What to check
- Retrieve and record freeze frame and all stored codes with a scan tool
- Visually inspect TPS connector, pins, and wiring for damage, corrosion or disconnection
- Backprobe TPS connector and verify reference voltage (~5 V) with ignition ON
- Verify TPS signal voltage at closed throttle and that it changes smoothly when throttle is moved
- Check TPS ground continuity to chassis/ECU ground
- Perform continuity check from TPS pins to corresponding ECU pins to locate open/short
Signal parameters
- Reference voltage: approx. 5.0 V (with ignition ON)
- Sensor ground: ~0 V (close to chassis/ECU ground)
- Closed-throttle signal: typically ~0.2–1.0 V (model dependent)
- Wide-open-throttle signal: typically ~4.0–4.8 V (model dependent)
- Signal should change smoothly and monotonically with throttle movement (no jumps or drops to 0 V)
Diagnostic algorithm
- Connect a scan tool, read P1703 and any related codes, save freeze frame data.
- Visually inspect the TPS connector and harness at the throttle body for damage, melting, corrosion or pin push-out.
- Backprobe the TPS connector: with ignition ON (engine OFF) verify 5 V reference, ground continuity, and measure the TPS signal voltage at closed throttle.
- Slowly open and close the throttle while observing signal voltage: confirm smooth change from closed-throttle voltage toward wide-open voltage. Note any drop to 0 V or sudden grounding.
- If reference or ground missing, trace and repair the wiring between TPS and power/ground source (fuse, ignition switch, chassis ground).
- If reference and ground are good but signal is open/grounded, check continuity of the signal wire from TPS to the ECU pin. Repair any broken or shorted wire.
- If wiring checks OK but signal is erratic or absent, replace the TPS. Reconnect and clear codes.
- After repair, erase codes and perform a road test or throttle exercise while monitoring live data to confirm proper operation and that the code does not return.
- If problem persists after wiring and sensor replacement, consider ECU input circuit inspection or professional ECU repair.
Likely causes
- Wiring rubbed through and shorted to chassis ground near the throttle body
- Connector contaminated with corrosion or moisture causing open/ground condition
- TPS internal failure (open pot or broken trace)
- Pin pushed out of connector or broken terminal
- Aftermarket throttle or intake work disturbed the harness
Fault status
Status
ECM detected an open circuit or a short to ground on the throttle position sensor signal circuit. Inspect TPS and wiring; correct any open/short and verify proper TPS voltage and response.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
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