Mitsubishi S12A2 — Testing compression pressure
Testing & diagnosis · Engine
For the Mitsubishi S12A2, from the Mitsubishi service manual.
Applies to: Mitsubishi S12A2
Before you start
- Measure all cylinders.
- Measure engine speed as well.
Procedure
- Disconnect the main harness from the relay connector.
- Disconnect the high pressure pump solenoid connector.
- Select a cylinder and remove the injector.
- Install a gauge adapter and compression gauge.
- Start the engine using starter and read compression gauge.
- If measured value is at limit or below, overhaul the engine.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Compression pressure standard: 2.35 MPa
- Compression pressure limit: 1.86 MPa
Full service-parts list: Mitsubishi S12A2 →
Source: Mitsubishi 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.