Kohler — Throttle Position Sensor (TPS) Test with Volt Meter
Testing & diagnosis
From a Kohler service manual covering: ECV850, ECV860, ECV870, ECV880. Check it applies to your exact model before use.
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Before you start
- Avoid putting excessive pressure on or against connector pins; flat pin probes recommended.
Procedure
- Measure voltage supply to sensor from ECU by probing terminals B & C on harness side with TPS connector removed and key ON.
- Voltage should be 5.00 +/- 0.20 volts.
- If supply voltage is good, plug sensor back into harness.
- Probe sensor signal wire at terminal A at TPS or pin Black 12 at ECU.
- Signal should start between 0.6-1.2 volts at low idle and grow smoothly to 4.3-4.8 volts at full open.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Supply voltage 5.00 +/- 0.20 volts
- Signal 0.6-1.2 volts at low idle
- Signal 4.3-4.8 volts at wide open throttle
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.