11
11-13
Powertard Brake System
Symptoms
Powertard brake fails to operate
Turning Powertard switch OFF does not
cancel Powertard braking
Reference Gr
Possible causes
Lubrication oil is cold and too viscous O O
Powertard clearance too large O
Electrical system
Blown fuse O
Gr13
Improper connection of harnesses and connectors O
Defective clutch switch O O
Defective accelerator switch O O
Defective transmission neutral switch O O
Defective powertard switch (combination switch) O O
Defective meter cluster O O
Defective engine speed sensor O O
Defective powertard solenoid valve O O
Defective engine control unit O O
Defective ABS exhaust brake cut relay <ABS/ASR> O O Gr35
Defective Powertard O O
Valve mechanism
Broken or weak exhaust valve springs O
Exhaust valve sticky or not smooth in operation O
Improperly adjusted powertard clearance O
Oil leakage in Powertard system O
Engine oil pressure too low O
Insufficient engine oil flow
Air present in engine oil O
Oil leakage from around cylinder head and rocker case O
Oil passage leading to powertard assembly clogged O
Oil leakage from powertard brake system O
Gr12
Defective control valve O
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