Kohler — GCU Ground and Power Tests
Testing & diagnosis · Governor control unit
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
- Use proper sized probes to avoid connector damage.
Procedure
- Switch key OFF; remove GCU from bracket and unplug harness.
- Test 1: check continuity for good ground.
- Test 2: turn key ON; measure voltage.
- Voltage should be within +/- 1 V of battery voltage.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Voltage within +/- 1 V of battery voltage
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.