NO.21 ENGINE NOISE [MZR 2.5]
| 21 | ENGINE NOISE |
|---|
| DESCRIPTION | Engine noise from under hood. |
| POSSIBLE CAUSE | Squeal, click or chirp noise: Improper engine oil level Improper drive belt tension Auto tensioner bearing malfunction Generator installation Improper installation of purge solenoid valve Splash shield or under cover looseness (splashed water to drive belts) Rattle sound noise: Loose parts Hiss sound noise: Vacuum leakage Loose spark plug Air leakage from intake air system Rumble or grind noise: Improper drive belt tension Loose parts Fluid level low or air in power steering fluid Rap or roar noise: Dynamic dumper looseness Exhaust system looseness Intake air system looseness Variable valve timing actuator malfunction Variable tumble control system malfunction Improper balancer unit backlash Other noise: Tappet noise Timing chain noise |
NO.22 VIBRATION CONCERNS (ENGINE) [MZR 2.5]
| 22 | VIBRATION CONCERNS (ENGINE) |
|---|
| DESCRIPTION | Vibration from under hood or driveline. |
| POSSIBLE CAUSE | Loose attaching bolts or worn parts Cooling fan Drive belt and pulleys Generator Engine mounts Exhaust system mounts Components malfunction such as worn parts Improper balance of wheels and tires Driveline malfunction Suspension malfunction |
Vibration Method
- If a malfunction occurs or becomes worse while driving on a rough road or when the engine is vibrating, perform the steps below. NOTE: There are several reasons why the vehicle or engine vibration could cause an electrical malfunction. Inspect the following: 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 a wiring harness to become pinched between parts. The connector joints, points of vibration, and places where wiring harnesses pass such as through the firewall and body panels are the major areas to be checked.
Scheme 63
Scheme 63: 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 the engine starts and runs, perform the following steps during idle.
- Access 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 PID value is unstable, inspect for poor connection.
Scheme 64
Scheme 64: 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 the engine starts and runs, perform the following steps during idle.
- Access PIDs for the switch you are inspecting.
- Slightly shake each connector or wiring harness vertically and horizontally while monitoring the PID. If PID value is unstable, inspect for poor connection.
