NO.21 ENGINE NOISE [MZR 1.5]
| 21 | ENGINE NOISE |
|---|
| DESCRIPTION | Engine noise from under hood. |
| POSSIBLE CAUSE | Squeal, click or chirp noise: Improper drive belt tension Loose installation of solenoid valves Improper engine oil level Generator installation (alignment) Splash shield or under cover looseness (splashed water to drive belt) Rumble or grind noise: Improper drive belt tension Rattle sound noise: Loose parts Hiss sound noise: Air leakage from intake-air system Loose spark plug Vacuum leakage Rap or roar sound noise: Dynamic damper looseness Exhaust system looseness Intake-air system looseness Variable valve timing actuator malfunction Variable tumble actuator improper operation Other noise: Tappet noise Timing chain noise PCM malfunction |
NO.22 VIBRATION CONCERNS (ENGINE) [MZR 1.5]
| 22 | VIBRATION CONCERNS (ENGINE) |
|---|
| DESCRIPTION | Vibration from under hood or driveline. |
| POSSIBLE CAUSE | Loose attaching bolts or worn parts Components malfunction such as worn parts PCM malfunction |
Vibration Method
- If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. NOTE: There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to inspect for are: Connectors not fully seated Wiring harnesses not having full play Wiring harnesses laying across brackets or moving parts Wiring harnesses routed too close to hot parts An improperly routed, improperly clamped, or loose wiring harness can cause wiring to become pinched between parts. The connector joints, points of vibration, and places where wiring harnesses pass through the fire wall, body panels, etc. are the major areas to be inspected.
Scheme 12
Scheme 12: Inspection Method for Switch Connectors or Wiring Harnesses
- Connect the M-MDS to the DLC-2.
- Switch the ignition to ON (engine off). NOTE: If engine starts and runs, perform the following steps during idle.
- Access the PIDs for the switch you are inspecting.
- Turn the switch on manually.
- Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID. If the PID value is unstable, inspect for poor connection. see scheme 6: Inspecting Method For Switch Connectors And Wiring Harnesses
Scheme 13
Scheme 13: Inspection Method for Sensor Connectors or Wiring Harnesses
- Connect the M-MDS to the DLC-2.
- Switch the ignition to ON (engine off). NOTE: If engine starts and runs, perform the following steps during idle.
- Access the PIDs for the switch you are inspecting.
- Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID. If the PID value is unstable, inspect for poor connection. see scheme 7: Inspectiing Method For Sensor Connectors And Wiring Harnesses
