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44 AUTOMATIC GEARBOX 10 FAULT DIAGNOSIS FAULT SYMPTOMS SYMPTOM 1 - Intermittent drive and high pitched FAULT - Low fluid level or restricted filter SYMPTOM 2 - No drive in reverse Select ’D’ • No drive FAULT - Continue with Symptom 3 • Drives forward FAULT - Reverse gear interlock valve seized Select ’1’ • No engine braking FAULT - Clutch brake 3 SYMPTOM 3 - No drive from rest with ’D’ selected Select ’1’ • Vehicle drives FAULT - No 2 freewheel • No drive Carry out main line pressure check • Normal pressure FAULT - Clutch A • No pressure FAULT - Blocked filter or pump failure • Low pressure FAULT - Restricted filter or sticking primary SYMPTOM 4 - Slip in all forward gears Carry out main line pressure check • No pressure FAULT - Blocked filter or pump failure • Low pressure FAULT - Restricted filter or sticking primary • Normal pressure FAULT - Clutch ’A’ SYMPTOM 5 - Harsh engagement ’N’ to ’D’ Check engine idle speed Carry out main line pressure check • High pressure FAULT - Primary regulator stuck • Normal pressure FAULT - Clutch ’A’ or damper for clutch’A’ SYMPTOM 6 - Fierce shift or flare 1st to 2nd shift Check engine idle speed Carry out mainline pressure check • High pressure FAULT - Continue with symptom 5 • Normal pressure FAULT - Modulator valve or dampers for clutch SYMPTOM 7 - Fierce shift or flare 2nd to 3rd Carry out mainline pressure check • High pressure FAULT - Continue with symptom 5 • Normal pressure FAULT - Modulator valve or clutch ’B’ damper SYMPTOM 8 - No 3rd gear FAULT - 2-3 shift valve SYMPTOM 9 - No 4th gear ’D’ selected FAULT - 4th to 3rd downshift valve stuck or 3rd |