| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| 1 | Does the engine knock at idle when hot? | Go to Step 2 | System OK | |
| 2 | Inspect the drive belts. Are the belts loose or worn? | Go to Step 3 | Go to Step 4 | |
| 3 | Tension or replace the belts, as necessary. Is the repair complete? | Go to Step 1 | ||
| 4 | Inspect the A/C compressor and the generator. Is either the compressor or the generator faulty? | Go to Step 5 | Go to Step 6 | |
| 5 | Replace the faulty A/C compressor or the generator. Is the repair complete? | Go to Step 1 | ||
| 6 | Inspect the valve train. Are valve train components faulty? | Go to Step 7 | Go to Step 8 | |
| 7 | Replace the faulty valve train components. Is the repair complete? | Go to Step 1 | ||
| 8 | Inspect the engine oil. Is the proper viscosity oil used in the crankcase? | Go to Step 10 | Go to Step 9 | |
| 9 | Install oil of the proper viscosity for the expected seasonal temperatures. Is the repair complete? | Go to Step 1 | ||
| 10 | Inspect the piston pin clearance. Is the clearance more than the specified value? | 0.02 mm (0.0008 in) | Go to Step 11 | Go to Step 12 |
| 11 | Replace the piston and the pin. Is the repair complete? | Go to Step 1 | ||
| 12 | Inspect the connecting rod alignment. Is the alignment faulty? | Go to Step 13 | Go to Step 14 | |
| 13 | Inspect and replace rods, as necessary. Is the repair complete? | Go to Step 1 | ||
| 14 | Inspect the piston-to-bore clearance. Is the clearance within the specified range? | 0.020-0.040 mm (0.0008-0.0016 in) | Go to Step 16 | Go to Step 15 |
| 15 | Hone the bore and fit a new piston. Is the repair complete? | Go to Step 1 | ||
| 16 | Inspect the crankshaft balancer. Is the balancer loose? | Go to Step 17 | Go to Step 18 | |
| 17 | Torque or replace worn parts. Is the repair complete? | Go to Step 1 | ||
| 18 | Inspect the piston pin offset. Is the offset toward the thrust side greater than the specified value? | 0.9 mm (0.036 in) | Go to Step 19 | System OK |
| 19 | Install the correct piston. Is the repair complete? | Go to Step 1 |
Knocks at Idle Hot